Migrate base::{size,empty,data} to STL equivalents in //content.

Bug: 1299695
Change-Id: Iefec40ecc9327c04732785eaed5a3214d17e552f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3491685
Reviewed-by: Lei Zhang <thestig@chromium.org>
Owners-Override: Lei Zhang <thestig@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#975485}

content/app/content_main_runner_impl.cc

@@ -292,7 +292,7 @@ pid_t LaunchZygoteHelper(base::CommandLine* cmd_line,
       switches::kVModule,
   };
   cmd_line->CopySwitchesFrom(*base::CommandLine::ForCurrentProcess(),
-                             kForwardSwitches, base::size(kForwardSwitches));
+                             kForwardSwitches, std::size(kForwardSwitches));
 
   GetContentClient()->browser()->AppendExtraCommandLineSwitches(cmd_line, -1);
 
@@ -606,7 +606,7 @@ int NO_STACK_PROTECTOR RunZygote(ContentMainDelegate* delegate) {
 
   mojo::core::InitFeatures();
 
-  for (size_t i = 0; i < base::size(kMainFunctions); ++i) {
+  for (size_t i = 0; i < std::size(kMainFunctions); ++i) {
     if (process_type == kMainFunctions[i].name)
       return kMainFunctions[i].function(std::move(main_params));
   }
@@ -673,7 +673,7 @@ RunOtherNamedProcessTypeMain(const std::string& process_type,
     base::HangWatcher::GetInstance()->Start();
   }
 
-  for (size_t i = 0; i < base::size(kMainFunctions); ++i) {
+  for (size_t i = 0; i < std::size(kMainFunctions); ++i) {
     if (process_type == kMainFunctions[i].name) {
       auto exit_code =
           delegate->RunProcess(process_type, std::move(main_function_params));

content/app_shim_remote_cocoa/window_occlusion_browsertest_mac.mm

@@ -317,7 +317,7 @@ IN_PROC_BROWSER_TEST_F(
   const NSSize window_offsets[] = {
       {1.0, 0.0}, {-1.0, 0.0}, {0.0, 1.0}, {0.0, -1.0}};
   NSRect window_b_frame = [window_b frame];
-  for (size_t i = 0; i < base::size(window_offsets); i++) {
+  for (size_t i = 0; i < std::size(window_offsets); i++) {
     // Move window b so that it no longer completely covers
     // window_a's webcontents.
     NSRect offset_window_frame = NSOffsetRect(

content/browser/accessibility/accessibility_event_recorder_auralinux.cc

@@ -8,7 +8,6 @@
 #include <atk/atkutil.h>
 #include <atspi/atspi.h>
 
-#include "base/cxx17_backports.h"
 #include "base/no_destructor.h"
 #include "base/process/process_handle.h"
 #include "base/strings/stringprintf.h"
@@ -294,7 +293,7 @@ void AccessibilityEventRecorderAuraLinux::AddATSPIEventListeners() {
       atspi_event_listener_new(OnATSPIEventReceived, this, nullptr);
 
   GError* error = nullptr;
-  for (size_t i = 0; i < base::size(kEventNames); i++) {
+  for (size_t i = 0; i < std::size(kEventNames); i++) {
     atspi_event_listener_register(atspi_event_listener_, kEventNames[i],
                                   &error);
     if (error) {
@@ -309,7 +308,7 @@ void AccessibilityEventRecorderAuraLinux::RemoveATSPIEventListeners() {
     return;
 
   GError* error = nullptr;
-  for (size_t i = 0; i < base::size(kEventNames); i++) {
+  for (size_t i = 0; i < std::size(kEventNames); i++) {
     atspi_event_listener_deregister(atspi_event_listener_, kEventNames[i],
                                     nullptr);
     if (error) {

content/browser/accessibility/accessibility_tree_formatter_android.cc

@@ -8,7 +8,6 @@
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/json/json_writer.h"
 #include "base/strings/string_number_conversions.h"
@@ -256,14 +255,14 @@ std::string AccessibilityTreeFormatterAndroid::ProcessTreeForOutput(
         &line);
   }
 
-  for (unsigned i = 0; i < base::size(BOOL_ATTRIBUTES); i++) {
+  for (unsigned i = 0; i < std::size(BOOL_ATTRIBUTES); i++) {
     const char* attribute_name = BOOL_ATTRIBUTES[i];
     absl::optional<bool> value = dict.FindBoolPath(attribute_name);
     if (value && *value)
       WriteAttribute(true, attribute_name, &line);
   }
 
-  for (unsigned i = 0; i < base::size(STRING_ATTRIBUTES); i++) {
+  for (unsigned i = 0; i < std::size(STRING_ATTRIBUTES); i++) {
     const char* attribute_name = STRING_ATTRIBUTES[i];
     std::string value;
     if (!dict.GetString(attribute_name, &value) || value.empty())
@@ -272,7 +271,7 @@ std::string AccessibilityTreeFormatterAndroid::ProcessTreeForOutput(
                    &line);
   }
 
-  for (unsigned i = 0; i < base::size(INT_ATTRIBUTES); i++) {
+  for (unsigned i = 0; i < std::size(INT_ATTRIBUTES); i++) {
     const char* attribute_name = INT_ATTRIBUTES[i];
     int value = dict.FindIntKey(attribute_name).value_or(0);
     if (value == 0)
@@ -280,7 +279,7 @@ std::string AccessibilityTreeFormatterAndroid::ProcessTreeForOutput(
     WriteAttribute(true, StringPrintf("%s=%d", attribute_name, value), &line);
   }
 
-  for (unsigned i = 0; i < base::size(ACTION_ATTRIBUTES); i++) {
+  for (unsigned i = 0; i < std::size(ACTION_ATTRIBUTES); i++) {
     const char* attribute_name = ACTION_ATTRIBUTES[i];
     absl::optional<bool> value = dict.FindBoolPath(attribute_name);
     if (value && *value) {

content/browser/accessibility/accessibility_tree_formatter_fuchsia.cc

@@ -398,14 +398,14 @@ std::string AccessibilityTreeFormatterFuchsia::ProcessTreeForOutput(
   node.GetString("role", &role_value);
   WriteAttribute(true, role_value, &line);
 
-  for (unsigned i = 0; i < base::size(kBoolAttributes); i++) {
+  for (unsigned i = 0; i < std::size(kBoolAttributes); i++) {
     const char* bool_attribute = kBoolAttributes[i];
     absl::optional<bool> value = node.FindBoolPath(bool_attribute);
     if (value && *value)
       WriteAttribute(/*include_by_default=*/true, bool_attribute, &line);
   }
 
-  for (unsigned i = 0; i < base::size(kStringAttributes); i++) {
+  for (unsigned i = 0; i < std::size(kStringAttributes); i++) {
     const char* string_attribute = kStringAttributes[i];
     std::string value;
     if (!node.GetString(string_attribute, &value) || value.empty())
@@ -416,7 +416,7 @@ std::string AccessibilityTreeFormatterFuchsia::ProcessTreeForOutput(
         base::StringPrintf("%s='%s'", string_attribute, value.c_str()), &line);
   }
 
-  for (unsigned i = 0; i < base::size(kIntAttributes); i++) {
+  for (unsigned i = 0; i < std::size(kIntAttributes); i++) {
     const char* attribute_name = kIntAttributes[i];
     int value = node.FindIntKey(attribute_name).value_or(0);
     if (value == 0)
@@ -425,7 +425,7 @@ std::string AccessibilityTreeFormatterFuchsia::ProcessTreeForOutput(
                    &line);
   }
 
-  for (unsigned i = 0; i < base::size(kDoubleAttributes); i++) {
+  for (unsigned i = 0; i < std::size(kDoubleAttributes); i++) {
     const char* attribute_name = kDoubleAttributes[i];
     int value = node.FindIntKey(attribute_name).value_or(0);
     if (value == 0)

content/browser/accessibility/browser_accessibility_state_impl_win.cc

@@ -11,7 +11,6 @@
 
 #include <memory>
 
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/no_destructor.h"
@@ -204,7 +203,7 @@ void BrowserAccessibilityStateImplWin::UpdateHistogramsOnOtherThread() {
   bool satogo = false;  // Very few users -- do not need uniques
   for (size_t i = 0; i < module_count; i++) {
     TCHAR filename[MAX_PATH];
-    GetModuleFileName(modules[i], filename, base::size(filename));
+    GetModuleFileName(modules[i], filename, std::size(filename));
     std::string module_name(base::FilePath(filename).BaseName().AsUTF8Unsafe());
     if (base::LowerCaseEqualsASCII(module_name, "fsdomsrv.dll"))
       g_jaws = true;

content/browser/android/java/java_type_unittest.cc

@@ -8,7 +8,6 @@
 
 #include <memory>
 
-#include "base/cxx17_backports.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
@@ -38,7 +37,7 @@ TEST_F(JavaTypeTest, ScalarTypes) {
      "Ljava/lang/Object;"},
     {"my.nested.Type$Foo", JavaType::TypeObject, "my/nested/Type$Foo",
      "Lmy/nested/Type$Foo;"}};
-  for (size_t i = 0; i < base::size(scalar_types); ++i) {
+  for (size_t i = 0; i < std::size(scalar_types); ++i) {
     JavaType jt = JavaType::CreateFromBinaryName(scalar_types[i].binary_type);
     EXPECT_EQ(scalar_types[i].java_type, jt.type);
     EXPECT_FALSE(jt.inner_type);

content/browser/android/message_port_descriptor.cc

@@ -7,11 +7,9 @@
 // /third_party/blink/public/common/messaging/message_port_descriptor.h.
 
 #include "third_party/blink/public/common/messaging/message_port_descriptor.h"
-
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/scoped_java_ref.h"
-#include "base/cxx17_backports.h"
 #include "base/unguessable_token.h"
 #include "content/public/android/content_jni_headers/AppWebMessagePortDescriptor_jni.h"
 #include "mojo/public/cpp/system/message_pipe.h"
@@ -43,7 +41,7 @@ JNI_AppWebMessagePortDescriptor_CreatePair(JNIEnv* env) {
   uint64_t pointers[2] = {reinterpret_cast<uint64_t>(port0),
                           reinterpret_cast<uint64_t>(port1)};
   return base::android::ToJavaLongArray(
-      env, reinterpret_cast<const int64_t*>(pointers), base::size(pointers));
+      env, reinterpret_cast<const int64_t*>(pointers), std::size(pointers));
 }
 
 JNI_EXPORT jlong JNI_AppWebMessagePortDescriptor_Create(JNIEnv* env,
@@ -134,8 +132,7 @@ JNI_AppWebMessagePortDescriptor_PassSerialized(
                             id.GetLowForSerialization(),
                             id.GetHighForSerialization(), sequence_number};
   return base::android::ToJavaLongArray(
-      env, reinterpret_cast<const int64_t*>(serialized),
-      base::size(serialized));
+      env, reinterpret_cast<const int64_t*>(serialized), std::size(serialized));
 }
 
 JNI_EXPORT void JNI_AppWebMessagePortDescriptor_CloseAndDestroy(
@@ -171,4 +168,4 @@ JNI_EXPORT void JNI_AppWebMessagePortDescriptor_DisentangleCloseAndDestroy(
   // Reset it and finally delete the object.
   message_port_descriptor->Reset();
   delete message_port_descriptor;
-}
+}

content/browser/attribution_reporting/attribution_report.cc

@@ -10,7 +10,6 @@
 
 #include "base/check.h"
 #include "base/check_op.h"
-#include "base/cxx17_backports.h"
 #include "base/memory/raw_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
@@ -242,7 +241,7 @@ std::string AttributionReport::PrivacyBudgetKey() const {
   ctx->Update(kVersion, sizeof(kVersion));
 
   std::string output(crypto::kSHA256Length, 0);
-  ctx->Finish(base::data(output), output.size());
+  ctx->Finish(std::data(output), output.size());
 
   return output;
 }

content/browser/blob_storage/blob_url_unittest.cc

@@ -8,7 +8,6 @@
 #include <memory>
 
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ -136,12 +135,12 @@ class BlobURLTest : public testing::Test {
     const char kFilename1[] = "FileSystemFile1.dat";
     temp_file_system_file1_ = GetFileSystemURL(kFilename1);
     WriteFileSystemFile(kFilename1, kTestFileSystemFileData1,
-                        base::size(kTestFileSystemFileData1) - 1,
+                        std::size(kTestFileSystemFileData1) - 1,
                         &temp_file_system_file_modification_time1_);
     const char kFilename2[] = "FileSystemFile2.dat";
     temp_file_system_file2_ = GetFileSystemURL(kFilename2);
     WriteFileSystemFile(kFilename2, kTestFileSystemFileData2,
-                        base::size(kTestFileSystemFileData2) - 1,
+                        std::size(kTestFileSystemFileData2) - 1,
                         &temp_file_system_file_modification_time2_);
   }
 
@@ -355,13 +354,13 @@ class BlobURLTest : public testing::Test {
 
 TEST_F(BlobURLTest, TestGetSimpleDataRequest) {
   blob_data_->AppendData(kTestData1);
-  TestSuccessNonrangeRequest(kTestData1, base::size(kTestData1) - 1);
+  TestSuccessNonrangeRequest(kTestData1, std::size(kTestData1) - 1);
 }
 
 TEST_F(BlobURLTest, TestGetSimpleFileRequest) {
   blob_data_->AppendFile(temp_file1_, 0, std::numeric_limits<uint64_t>::max(),
                          base::Time());
-  TestSuccessNonrangeRequest(kTestFileData1, base::size(kTestFileData1) - 1);
+  TestSuccessNonrangeRequest(kTestFileData1, std::size(kTestFileData1) - 1);
 }
 
 TEST_F(BlobURLTest, TestGetLargeFileRequest) {
@@ -405,7 +404,7 @@ TEST_F(BlobURLTest, TestGetSimpleFileSystemFileRequest) {
       0, std::numeric_limits<uint64_t>::max(), base::Time(),
       file_system_context_);
   TestSuccessNonrangeRequest(kTestFileSystemFileData1,
-                             base::size(kTestFileSystemFileData1) - 1);
+                             std::size(kTestFileSystemFileData1) - 1);
 }
 
 TEST_F(BlobURLTest, TestGetLargeFileSystemFileRequest) {
@@ -470,7 +469,7 @@ TEST_F(BlobURLTest, TestGetSimpleDataHandleRequest) {
       base::MakeRefCounted<storage::FakeBlobDataHandle>(kTestDataHandleData1,
                                                         ""));
   TestSuccessNonrangeRequest(kTestDataHandleData1,
-                             base::size(kTestDataHandleData1) - 1);
+                             std::size(kTestDataHandleData1) - 1);
 }
 
 TEST_F(BlobURLTest, TestGetComplicatedDataFileAndDiskCacheRequest) {
@@ -570,7 +569,7 @@ TEST_F(BlobURLTest, TestSideData) {
   expected_status_code_ = 200;
   expected_response_ = kTestDataHandleData2;
   TestRequest("GET", net::HttpRequestHeaders());
-  EXPECT_EQ(static_cast<int>(base::size(kTestDataHandleData2) - 1),
+  EXPECT_EQ(static_cast<int>(std::size(kTestDataHandleData2) - 1),
             response_headers_->GetContentLength());
 
   EXPECT_EQ(std::string(kTestDiskCacheSideData), response_metadata_);
@@ -583,7 +582,7 @@ TEST_F(BlobURLTest, TestZeroSizeSideData) {
   expected_status_code_ = 200;
   expected_response_ = kTestDataHandleData2;
   TestRequest("GET", net::HttpRequestHeaders());
-  EXPECT_EQ(static_cast<int>(base::size(kTestDataHandleData2) - 1),
+  EXPECT_EQ(static_cast<int>(std::size(kTestDataHandleData2) - 1),
             response_headers_->GetContentLength());
 
   EXPECT_TRUE(response_metadata_.empty());

content/browser/browser_child_process_host_impl.cc

@@ -10,7 +10,6 @@
 #include "base/bind.h"
 #include "base/clang_profiling_buildflags.h"
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/debug/dump_without_crashing.h"
 #include "base/feature_list.h"
 #include "base/files/file_path.h"
@@ -303,7 +302,7 @@ void BrowserChildProcessHostImpl::LaunchWithoutExtraCommandLineSwitches(
       switches::kVModule,
   };
   cmd_line->CopySwitchesFrom(browser_command_line, kForwardSwitches,
-                             base::size(kForwardSwitches));
+                             std::size(kForwardSwitches));
 
   // All processes should have a non-empty metrics name.
   if (data_.metrics_name.empty())

content/browser/browser_main_loop.cc

@@ -16,7 +16,6 @@
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/feature_list.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ -284,7 +283,7 @@ static void SetUpGLibLogHandler() {
   // Register GLib-handled assertions to go through our logging system.
   const char* const kLogDomains[] = {nullptr, "Gtk", "Gdk", "GLib",
                                      "GLib-GObject"};
-  for (size_t i = 0; i < base::size(kLogDomains); i++) {
+  for (size_t i = 0; i < std::size(kLogDomains); i++) {
     g_log_set_handler(
         kLogDomains[i],
         static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION | G_LOG_FLAG_FATAL |

content/browser/browser_url_handler_impl.cc

@@ -6,7 +6,6 @@
 
 #include <stddef.h>
 
-#include "base/cxx17_backports.h"
 #include "base/ranges/algorithm.h"
 #include "base/strings/string_util.h"
 #include "content/browser/renderer_host/debug_urls.h"
@@ -39,7 +38,7 @@ static bool HandleViewSource(GURL* url, BrowserContext* browser_context) {
     // Merge all the schemes for which view-source is allowed by default, with
     // the view-source schemes defined by the ContentBrowserClient.
     std::vector<std::string> all_allowed_sub_schemes;
-    for (size_t i = 0; i < base::size(default_allowed_sub_schemes); ++i)
+    for (size_t i = 0; i < std::size(default_allowed_sub_schemes); ++i)
       all_allowed_sub_schemes.push_back(default_allowed_sub_schemes[i]);
     GetContentClient()->browser()->GetAdditionalViewSourceSchemes(
         &all_allowed_sub_schemes);

content/browser/browsing_data/clear_site_data_handler_unittest.cc

@@ -479,7 +479,7 @@ TEST_F(ClearSiteDataHandlerTest, FormattedConsoleOutput) {
 
     // |NetworkServiceClient| creates a new |ClearSiteDataHandler| for each
     // navigation, redirect, or subresource header responses.
-    for (size_t i = 0; i < base::size(kTestCases); i++) {
+    for (size_t i = 0; i < std::size(kTestCases); i++) {
       TestHandler handler(
           base::BindRepeating(&FakeBrowserContextGetter),
           base::BindRepeating(&FakeWebContentsGetter), GURL(kTestCases[i].url),

content/browser/code_cache/generated_code_cache.cc

@@ -195,7 +195,7 @@ bool GeneratedCodeCache::IsValidHeader(
 }
 
 std::string GeneratedCodeCache::GetResourceURLFromKey(const std::string& key) {
-  constexpr size_t kPrefixStringLen = base::size(kPrefix) - 1;
+  constexpr size_t kPrefixStringLen = std::size(kPrefix) - 1;
   // |key| may not have a prefix and separator (e.g. for deduplicated entries).
   // In that case, return an empty string.
   const size_t separator_index = key.find(kSeparator);
@@ -404,8 +404,8 @@ void GeneratedCodeCache::WriteEntry(const GURL& url,
     uint8_t result[crypto::kSHA256Length];
     crypto::SHA256HashString(
         base::StringPiece(reinterpret_cast<char*>(copy.data()), copy.size()),
-        result, base::size(result));
-    std::string checksum_key = base::HexEncode(result, base::size(result));
+        result, std::size(result));
+    std::string checksum_key = base::HexEncode(result, std::size(result));
     small_buffer = base::MakeRefCounted<net::IOBufferWithSize>(
         kHeaderSizeInBytes + kSHAKeySizeInBytes);
     // Copy |checksum_key| into the small buffer.

content/browser/devtools/devtools_io_context.cc

@@ -5,7 +5,6 @@
 #include "content/browser/devtools/devtools_io_context.h"
 
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/task/sequenced_task_runner.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
@@ -67,7 +66,7 @@ bool DevToolsIOContext::IsTextMimeType(const std::string& mime_type) {
   static const char* kTextMIMETypePrefixes[] = {
       "text/", "application/x-javascript", "application/json",
       "application/xml"};
-  for (size_t i = 0; i < base::size(kTextMIMETypePrefixes); ++i) {
+  for (size_t i = 0; i < std::size(kTextMIMETypePrefixes); ++i) {
     if (base::StartsWith(mime_type, kTextMIMETypePrefixes[i],
                          base::CompareCase::INSENSITIVE_ASCII))
       return true;

content/browser/download/save_package_unittest.cc

@@ -2,12 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/browser/download/save_package.h"
+
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/run_loop.h"
@@ -15,7 +16,6 @@
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "content/browser/download/save_file_manager.h"
-#include "content/browser/download/save_package.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/common/url_constants.h"
 #include "content/test/test_render_view_host.h"
@@ -187,7 +187,7 @@ static const struct {
 };
 
 TEST_F(SavePackageTest, TestSuccessfullyGenerateSavePackageFilename) {
-  for (size_t i = 0; i < base::size(kGeneratedFiles); ++i) {
+  for (size_t i = 0; i < std::size(kGeneratedFiles); ++i) {
     base::FilePath::StringType file_name;
     bool ok = GetGeneratedFilename(true,
                                    kGeneratedFiles[i].disposition,
@@ -200,7 +200,7 @@ TEST_F(SavePackageTest, TestSuccessfullyGenerateSavePackageFilename) {
 }
 
 TEST_F(SavePackageTest, TestUnSuccessfullyGenerateSavePackageFilename) {
-  for (size_t i = 0; i < base::size(kGeneratedFiles); ++i) {
+  for (size_t i = 0; i < std::size(kGeneratedFiles); ++i) {
     base::FilePath::StringType file_name;
     bool ok = GetGeneratedFilename(false,
                                    kGeneratedFiles[i].disposition,

content/browser/file_system/file_system_url_loader_factory_browsertest.cc

@@ -685,7 +685,7 @@ IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, AutoMountNoHandler) {
 
 IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, FileTest) {
   base::ScopedAllowBlockingForTesting allow_blocking;
-  WriteFile("file1.dat", kTestFileData, base::size(kTestFileData) - 1);
+  WriteFile("file1.dat", kTestFileData, std::size(kTestFileData) - 1);
   auto client = TestLoad(CreateFileSystemURL("file1.dat"));
 
   EXPECT_TRUE(client->has_received_response());
@@ -707,7 +707,7 @@ IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, CrossOriginFileBlocked) {
   IsolateAllSitesForTesting(base::CommandLine::ForCurrentProcess());
 
   base::ScopedAllowBlockingForTesting allow_blocking;
-  WriteFile("file1.dat", kTestFileData, base::size(kTestFileData) - 1);
+  WriteFile("file1.dat", kTestFileData, std::size(kTestFileData) - 1);
 
   // Navigate main frame to foo.com.
   ASSERT_TRUE(embedded_test_server()->Start());
@@ -781,7 +781,7 @@ IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest,
 IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest,
                        FileTestMultipleRangesNotSupported) {
   base::ScopedAllowBlockingForTesting allow_blocking;
-  WriteFile("file1.dat", kTestFileData, base::size(kTestFileData) - 1);
+  WriteFile("file1.dat", kTestFileData, std::size(kTestFileData) - 1);
   net::HttpRequestHeaders headers;
   headers.SetHeader(net::HttpRequestHeaders::kRange,
                     "bytes=0-5,10-200,200-300");
@@ -794,7 +794,7 @@ IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest,
 
 IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, FileRangeOutOfBounds) {
   base::ScopedAllowBlockingForTesting allow_blocking;
-  WriteFile("file1.dat", kTestFileData, base::size(kTestFileData) - 1);
+  WriteFile("file1.dat", kTestFileData, std::size(kTestFileData) - 1);
   net::HttpRequestHeaders headers;
   headers.SetHeader(net::HttpRequestHeaders::kRange,
                     net::HttpByteRange::Bounded(500, 1000).GetHeaderValue());
@@ -838,7 +838,7 @@ IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, NoSuchFile) {
 
 IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, FileCancel) {
   base::ScopedAllowBlockingForTesting allow_blocking;
-  WriteFile("file1.dat", kTestFileData, base::size(kTestFileData) - 1);
+  WriteFile("file1.dat", kTestFileData, std::size(kTestFileData) - 1);
   auto client = TestLoadNoRun(CreateFileSystemURL("file1.dat"));
 
   // client.reset();
@@ -872,7 +872,7 @@ IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, FileGetMimeType) {
 
 IN_PROC_BROWSER_TEST_P(FileSystemURLLoaderFactoryTest, FileIncognito) {
   base::ScopedAllowBlockingForTesting allow_blocking;
-  WriteFile("file", kTestFileData, base::size(kTestFileData) - 1);
+  WriteFile("file", kTestFileData, std::size(kTestFileData) - 1);
 
   // Creates a new filesystem context for incognito mode.
   scoped_refptr<FileSystemContext> file_system_context =

content/browser/file_system_access/safe_move_helper.cc

@@ -99,7 +99,7 @@ class HashCalculator : public base::RefCounted<HashCalculator> {
     }
     if (bytes_read == 0) {
       std::string hash_str(hash_->GetHashLength(), 0);
-      hash_->Finish(base::data(hash_str), hash_str.size());
+      hash_->Finish(std::data(hash_str), hash_str.size());
       std::move(callback_).Run(base::File::FILE_OK, hash_str, file_size_);
       return;
     }

content/browser/font_unique_name_lookup/font_unique_name_browsertest.cc

@@ -4,7 +4,6 @@
 
 #include <memory>
 
-#include "base/cxx17_backports.h"
 #include "base/test/scoped_feature_list.h"
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
@@ -157,7 +156,7 @@ IN_PROC_BROWSER_TEST_F(FontUniqueNameBrowserTest,
 
   unsigned num_added_nodes = static_cast<unsigned>(
       content::EvalJs(shell(), "addTestNodes()").ExtractInt());
-  ASSERT_EQ(num_added_nodes, base::size(kExpectedFontFamilyNames));
+  ASSERT_EQ(num_added_nodes, std::size(kExpectedFontFamilyNames));
 
   std::unique_ptr<base::DictionaryValue> params =
       std::make_unique<base::DictionaryValue>();
@@ -177,7 +176,7 @@ IN_PROC_BROWSER_TEST_F(FontUniqueNameBrowserTest,
       result->FindKeyOfType("nodeIds", base::Value::Type::LIST)->Clone();
   base::Value::ConstListView nodes_view = node_list.GetListDeprecated();
   ASSERT_EQ(nodes_view.size(), num_added_nodes);
-  ASSERT_EQ(nodes_view.size(), base::size(kExpectedFontFamilyNames));
+  ASSERT_EQ(nodes_view.size(), std::size(kExpectedFontFamilyNames));
   for (size_t i = 0; i < nodes_view.size(); ++i) {
     const base::Value& nodeId = nodes_view[i];
     params = std::make_unique<base::DictionaryValue>();

content/browser/font_unique_name_lookup/font_unique_name_lookup_unittest.cc

@@ -2,21 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "testing/gtest/include/gtest/gtest.h"
+#include "content/browser/font_unique_name_lookup/font_unique_name_lookup.h"
+
+#include <functional>
+#include <memory>
 
 #include "base/android/build_info.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/strings/string_util.h"
-#include "content/browser/font_unique_name_lookup/font_unique_name_lookup.h"
+#include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/blink/public/common/font_unique_name_lookup/font_table_matcher.h"
 
-#include <functional>
-#include <memory>
-
 namespace {
 
 static const char* const kAndroidFontPaths[] = {"/system/fonts",
@@ -231,7 +230,7 @@ size_t GetNumTables(base::File& font_file) {
   font_file.Seek(base::File::FROM_BEGIN, 5);
   uint8_t num_tables_bytes[2] = {};
   font_file.ReadAtCurrentPos(reinterpret_cast<char*>(num_tables_bytes),
-                             base::size(num_tables_bytes));
+                             std::size(num_tables_bytes));
   uint16_t num_tables =
       static_cast<uint16_t>(num_tables_bytes[0] + (num_tables_bytes[1] << 8));
   return num_tables;
@@ -265,7 +264,7 @@ class FontFileCorruptor {
       for (size_t i = 0; i < num_tables; ++i) {
         CHECK_EQ(static_cast<int>(kSizeOneTableRecord),
                  font_file.Write(kOffsetTableRecords + i * kSizeOneTableRecord,
-                                 garbage, base::size(garbage)));
+                                 garbage, std::size(garbage)));
       }
     });
   }

content/browser/gpu/compositor_util.cc

@@ -221,8 +221,8 @@ const GpuFeatureData GetGpuFeatureData(
     {"direct_rendering_display_compositor", gpu::kGpuFeatureStatusEnabled,
      !features::IsDrDcEnabled(), DisableInfo::NotProblem(), false},
   };
-  DCHECK(index < base::size(kGpuFeatureData));
-  *eof = (index == base::size(kGpuFeatureData) - 1);
+  DCHECK(index < std::size(kGpuFeatureData));
+  *eof = (index == std::size(kGpuFeatureData) - 1);
   return kGpuFeatureData[index];
 }
 

content/browser/gpu/gpu_data_manager_testing_autogen.cc

@@ -19,8 +19,8 @@ const GpuControlList::Entry kGpuDataManagerTestingEntries[] = {
     {
         1,  // id
         "GpuDataManagerImplPrivateTest.GpuSideBlocklisting.0",
-        base::size(kFeatureListForGpuManagerTestingEntry1),  // features size
-        kFeatureListForGpuManagerTestingEntry1,              // features
+        std::size(kFeatureListForGpuManagerTestingEntry1),  // features size
+        kFeatureListForGpuManagerTestingEntry1,             // features
         0,        // DisabledExtensions size
         nullptr,  // DisabledExtensions
         0,        // DisabledWebGLExtensions size
@@ -53,8 +53,8 @@ const GpuControlList::Entry kGpuDataManagerTestingEntries[] = {
     {
         2,  // id
         "GpuDataManagerImplPrivateTest.GpuSideBlocklisting.1",
-        base::size(kFeatureListForGpuManagerTestingEntry2),  // features size
-        kFeatureListForGpuManagerTestingEntry2,              // features
+        std::size(kFeatureListForGpuManagerTestingEntry2),  // features size
+        kFeatureListForGpuManagerTestingEntry2,             // features
         0,        // DisabledExtensions size
         nullptr,  // DisabledExtensions
         0,        // DisabledWebGLExtensions size
@@ -87,8 +87,8 @@ const GpuControlList::Entry kGpuDataManagerTestingEntries[] = {
     {
         3,  // id
         "GpuDataManagerImplPrivateTest.GpuSideBlocklistingWebGL.0",
-        base::size(kFeatureListForGpuManagerTestingEntry3),  // features size
-        kFeatureListForGpuManagerTestingEntry3,              // features
+        std::size(kFeatureListForGpuManagerTestingEntry3),  // features size
+        kFeatureListForGpuManagerTestingEntry3,             // features
         0,        // DisabledExtensions size
         nullptr,  // DisabledExtensions
         0,        // DisabledWebGLExtensions size
@@ -121,8 +121,8 @@ const GpuControlList::Entry kGpuDataManagerTestingEntries[] = {
     {
         4,  // id
         "GpuDataManagerImplPrivateTest.GpuSideBlocklistingWebGL.1",
-        base::size(kFeatureListForGpuManagerTestingEntry4),  // features size
-        kFeatureListForGpuManagerTestingEntry4,              // features
+        std::size(kFeatureListForGpuManagerTestingEntry4),  // features size
+        kFeatureListForGpuManagerTestingEntry4,             // features
         0,        // DisabledExtensions size
         nullptr,  // DisabledExtensions
         0,        // DisabledWebGLExtensions size
@@ -155,8 +155,8 @@ const GpuControlList::Entry kGpuDataManagerTestingEntries[] = {
     {
         5,  // id
         "GpuDataManagerImplPrivateTest.GpuSideException",
-        base::size(kFeatureListForGpuManagerTestingEntry5),  // features size
-        kFeatureListForGpuManagerTestingEntry5,              // features
+        std::size(kFeatureListForGpuManagerTestingEntry5),  // features size
+        kFeatureListForGpuManagerTestingEntry5,             // features
         0,        // DisabledExtensions size
         nullptr,  // DisabledExtensions
         0,        // DisabledWebGLExtensions size
@@ -183,14 +183,14 @@ const GpuControlList::Entry kGpuDataManagerTestingEntries[] = {
              nullptr},                  // intel_gpu_generation
             &kMoreForEntry5_572251052,  // more data
         },
-        base::size(kExceptionsForEntry5),  // exceptions count
-        kExceptionsForEntry5,              // exceptions
+        std::size(kExceptionsForEntry5),  // exceptions count
+        kExceptionsForEntry5,             // exceptions
     },
     {
         6,  // id
         "GpuDataManagerImplPrivateTest.BlocklistAllFeatures",
-        base::size(kFeatureListForGpuManagerTestingEntry6),  // features size
-        kFeatureListForGpuManagerTestingEntry6,              // features
+        std::size(kFeatureListForGpuManagerTestingEntry6),  // features size
+        kFeatureListForGpuManagerTestingEntry6,             // features
         0,        // DisabledExtensions size
         nullptr,  // DisabledExtensions
         0,        // DisabledWebGLExtensions size

content/browser/gpu/gpu_process_host.cc

@@ -619,7 +619,7 @@ void GpuProcessHost::GetHasGpuProcess(base::OnceCallback<void(bool)> callback) {
     return;
   }
   bool has_gpu = false;
-  for (size_t i = 0; i < base::size(g_gpu_process_hosts); ++i) {
+  for (size_t i = 0; i < std::size(g_gpu_process_hosts); ++i) {
     GpuProcessHost* host = g_gpu_process_hosts[i];
     if (host && ValidateHost(host)) {
       has_gpu = true;
@@ -1198,7 +1198,7 @@ bool GpuProcessHost::LaunchGpuProcess() {
   // If you want a browser command-line switch passed to the GPU process
   // you need to add it to |kSwitchNames| at the beginning of this file.
   cmd_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
-                             base::size(kSwitchNames));
+                             std::size(kSwitchNames));
   cmd_line->CopySwitchesFrom(
       browser_command_line, switches::kGLSwitchesCopiedFromGpuProcessHost,
       switches::kGLSwitchesCopiedFromGpuProcessHostNumSwitches);

content/browser/host_zoom_map_impl_unittest.cc

@@ -6,7 +6,6 @@
 
 #include <stddef.h>
 
-#include "base/cxx17_backports.h"
 #include "base/memory/ref_counted.h"
 #include "base/test/simple_test_clock.h"
 #include "content/public/test/browser_task_environment.h"
@@ -72,8 +71,8 @@ TEST_F(HostZoomMapTest, GetAllZoomLevels) {
        zoomed},
       {HostZoomMap::ZOOM_CHANGED_FOR_SCHEME_AND_HOST, "zoomed.com", "https",
        zoomed}, };
-  ASSERT_EQ(base::size(expected), levels.size());
-  for (size_t i = 0; i < base::size(expected); ++i) {
+  ASSERT_EQ(std::size(expected), levels.size());
+  for (size_t i = 0; i < std::size(expected); ++i) {
     SCOPED_TRACE(testing::Message() << "levels[" << i << "]");
     EXPECT_EQ(expected[i].mode, levels[i].mode);
     EXPECT_EQ(expected[i].scheme, levels[i].scheme);
@@ -108,8 +107,8 @@ TEST_F(HostZoomMapTest, LastModifiedTimestamp) {
       {HostZoomMap::ZOOM_CHANGED_FOR_SCHEME_AND_HOST, "login", "chrome", 3.0,
        base::Time()},
   };
-  ASSERT_EQ(base::size(expected), levels.size());
-  for (size_t i = 0; i < base::size(expected); ++i) {
+  ASSERT_EQ(std::size(expected), levels.size());
+  for (size_t i = 0; i < std::size(expected); ++i) {
     SCOPED_TRACE(testing::Message() << "levels[" << i << "]");
     EXPECT_EQ(expected[i].mode, levels[i].mode);
     EXPECT_EQ(expected[i].scheme, levels[i].scheme);

content/browser/indexed_db/indexed_db_backing_store_unittest.cc

@@ -16,7 +16,6 @@
 #include "base/callback.h"
 #include "base/check_op.h"
 #include "base/containers/span.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/guid.h"
@@ -1009,7 +1008,7 @@ TEST_P(IndexedDBBackingStoreTestWithExternalObjects, DeleteRange) {
       IndexedDBKeyRange(keys[1], keys[3], false, true),
       IndexedDBKeyRange(keys[0], keys[3], true, true)};
 
-  for (size_t i = 0; i < base::size(ranges); ++i) {
+  for (size_t i = 0; i < std::size(ranges); ++i) {
     const int64_t database_id = 1;
     const int64_t object_store_id = i + 1;
     const IndexedDBKeyRange& range = ranges[i];
@@ -1104,7 +1103,7 @@ TEST_P(IndexedDBBackingStoreTestWithExternalObjects, DeleteRangeEmptyRange) {
       IndexedDBKeyRange(keys[2], keys[1], false, false),
       IndexedDBKeyRange(keys[2], keys[1], true, true)};
 
-  for (size_t i = 0; i < base::size(ranges); ++i) {
+  for (size_t i = 0; i < std::size(ranges); ++i) {
     const int64_t database_id = 1;
     const int64_t object_store_id = i + 1;
     const IndexedDBKeyRange& range = ranges[i];

content/browser/indexed_db/indexed_db_leveldb_coding_unittest.cc

@@ -12,7 +12,6 @@
 #include <utility>
 #include <vector>
 
-#include "base/cxx17_backports.h"
 #include "base/strings/string_piece.h"
 #include "components/services/storage/indexed_db/scopes/varint_coding.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -557,7 +556,7 @@ TEST(IndexedDBLevelDBCodingTest, EncodeDecodeIDBKeyPath) {
                        0      // Type is null
     };
     encoded_paths.push_back(
-        std::string(expected, expected + base::size(expected)));
+        std::string(expected, expected + std::size(expected)));
   }
 
   {
@@ -567,7 +566,7 @@ TEST(IndexedDBLevelDBCodingTest, EncodeDecodeIDBKeyPath) {
                        0      // Length is 0
     };
     encoded_paths.push_back(
-        std::string(expected, expected + base::size(expected)));
+        std::string(expected, expected + std::size(expected)));
   }
 
   {
@@ -577,7 +576,7 @@ TEST(IndexedDBLevelDBCodingTest, EncodeDecodeIDBKeyPath) {
                        3, 0, 'f', 0, 'o', 0, 'o'  // String length 3, UTF-16BE
     };
     encoded_paths.push_back(
-        std::string(expected, expected + base::size(expected)));
+        std::string(expected, expected + std::size(expected)));
   }
 
   {
@@ -588,7 +587,7 @@ TEST(IndexedDBLevelDBCodingTest, EncodeDecodeIDBKeyPath) {
                        'r'  // String length 7, UTF-16BE
     };
     encoded_paths.push_back(
-        std::string(expected, expected + base::size(expected)));
+        std::string(expected, expected + std::size(expected)));
   }
 
   {
@@ -603,7 +602,7 @@ TEST(IndexedDBLevelDBCodingTest, EncodeDecodeIDBKeyPath) {
                        'r'  // Member 3 (String length 7)
     };
     encoded_paths.push_back(
-        std::string(expected, expected + base::size(expected)));
+        std::string(expected, expected + std::size(expected)));
   }
 
   ASSERT_EQ(key_paths.size(), encoded_paths.size());
@@ -685,12 +684,12 @@ TEST(IndexedDBLevelDBCodingTest, DecodeLegacyIDBKeyPath) {
   {
     key_paths.emplace_back(u"foo");
     char expected[] = {0, 'f', 0, 'o', 0, 'o'};
-    encoded_paths.push_back(std::string(expected, base::size(expected)));
+    encoded_paths.push_back(std::string(expected, std::size(expected)));
   }
   {
     key_paths.emplace_back(u"foo.bar");
     char expected[] = {0, 'f', 0, 'o', 0, 'o', 0, '.', 0, 'b', 0, 'a', 0, 'r'};
-    encoded_paths.push_back(std::string(expected, base::size(expected)));
+    encoded_paths.push_back(std::string(expected, std::size(expected)));
   }
 
   ASSERT_EQ(key_paths.size(), encoded_paths.size());

content/browser/indexed_db/indexed_db_leveldb_operations.cc

@@ -137,7 +137,7 @@ std::string ReadCorruptionInfo(storage::FilesystemProxy* filesystem_proxy,
     if (file.IsValid()) {
       std::string input_js(file_info->size, '\0');
       if (file_info->size ==
-          file.Read(0, base::data(input_js), file_info->size)) {
+          file.Read(0, std::data(input_js), file_info->size)) {
         absl::optional<base::Value> val = base::JSONReader::Read(input_js);
         if (val && val->is_dict()) {
           std::string* s = val->FindStringKey("message");

content/browser/interest_group/auction_worklet_manager_unittest.cc

@@ -12,7 +12,6 @@
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/check.h"
-#include "base/cxx17_backports.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/bind.h"
@@ -1301,7 +1300,7 @@ TEST_F(AuctionWorkletManagerTest, BidderWorkletUrlRequestProtection) {
        "application/json"},
   };
 
-  for (size_t i = 0; i < base::size(kAllowedUrls); ++i) {
+  for (size_t i = 0; i < std::size(kAllowedUrls); ++i) {
     network::ResourceRequest request;
     request.url = kAllowedUrls[i].url;
     request.headers.SetHeader(net::HttpRequestHeaders::kAccept,
@@ -1332,7 +1331,7 @@ TEST_F(AuctionWorkletManagerTest, BidderWorkletUrlRequestProtection) {
       net::MutableNetworkTrafficAnnotationTag(TRAFFIC_ANNOTATION_FOR_TESTS));
   bidder_worklet->url_loader_factory().FlushForTesting();
   EXPECT_FALSE(bidder_worklet->url_loader_factory().is_connected());
-  EXPECT_EQ(base::size(kAllowedUrls),
+  EXPECT_EQ(std::size(kAllowedUrls),
             url_loader_factory_.pending_requests()->size());
   EXPECT_EQ("Unexpected request", TakeBadMessage());
 }
@@ -1361,7 +1360,7 @@ TEST_F(AuctionWorkletManagerTest, SellerWorkletUrlRequestProtection) {
        "application/json"},
   };
 
-  for (size_t i = 0; i < base::size(kAllowedUrls); ++i) {
+  for (size_t i = 0; i < std::size(kAllowedUrls); ++i) {
     network::ResourceRequest request;
     request.url = kAllowedUrls[i].url;
     request.headers.SetHeader(net::HttpRequestHeaders::kAccept,
@@ -1392,7 +1391,7 @@ TEST_F(AuctionWorkletManagerTest, SellerWorkletUrlRequestProtection) {
       net::MutableNetworkTrafficAnnotationTag(TRAFFIC_ANNOTATION_FOR_TESTS));
   seller_worklet->url_loader_factory().FlushForTesting();
   EXPECT_FALSE(seller_worklet->url_loader_factory().is_connected());
-  EXPECT_EQ(base::size(kAllowedUrls),
+  EXPECT_EQ(std::size(kAllowedUrls),
             url_loader_factory_.pending_requests()->size());
   EXPECT_EQ("Unexpected request", TakeBadMessage());
 }

content/browser/launch_as_mojo_client_browsertest.cc

@@ -72,7 +72,7 @@ class LaunchAsMojoClientBrowserTest : public ContentBrowserTest {
         switches::kOzonePlatform,
     };
     command_line.CopySwitchesFrom(cmdline, kSwitchesToCopy,
-                                  base::size(kSwitchesToCopy));
+                                  std::size(kSwitchesToCopy));
 #endif
 
 #if BUILDFLAG(IS_CHROMEOS_ASH)

content/browser/media/capture/desktop_streams_registry_impl.cc

@@ -6,7 +6,6 @@
 
 #include "base/base64.h"
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/location.h"
 #include "base/no_destructor.h"
 #include "base/time/time.h"
@@ -22,9 +21,9 @@ const int kApprovedStreamTimeToLiveSeconds = 10;
 
 std::string GenerateRandomStreamId() {
   char buffer[kStreamIdLengthBytes];
-  crypto::RandBytes(buffer, base::size(buffer));
+  crypto::RandBytes(buffer, std::size(buffer));
   std::string result;
-  base::Base64Encode(base::StringPiece(buffer, base::size(buffer)), &result);
+  base::Base64Encode(base::StringPiece(buffer, std::size(buffer)), &result);
   return result;
 }
 

content/browser/media/media_internals.cc

@@ -13,7 +13,6 @@
 #include "base/bind.h"
 #include "base/containers/adapters.h"
 #include "base/containers/cxx20_erase.h"
-#include "base/cxx17_backports.h"
 #include "base/feature_list.h"
 #include "base/memory/raw_ptr.h"
 #include "base/metrics/field_trial_params.h"
@@ -74,7 +73,7 @@ std::string EffectsToString(int effects) {
   };
 
   std::string ret;
-  for (size_t i = 0; i < base::size(flags); ++i) {
+  for (size_t i = 0; i < std::size(flags); ++i) {
     if (effects & flags[i].flag) {
       if (!ret.empty())
         ret += " | ";

content/browser/media/midi_host_unittest.cc

@@ -130,7 +130,7 @@ class MidiSessionClientForTesting : public midi::mojom::MidiSessionClient {
 
 class MidiHostTest : public testing::Test {
  public:
-  MidiHostTest() : data_(kNoteOn, kNoteOn + base::size(kNoteOn)), port_id_(0) {
+  MidiHostTest() : data_(kNoteOn, kNoteOn + std::size(kNoteOn)), port_id_(0) {
     browser_context_ = std::make_unique<TestBrowserContext>();
     rph_ = std::make_unique<MockRenderProcessHost>(browser_context_.get());
     std::unique_ptr<FakeMidiManagerFactory> factory =

content/browser/notifications/notification_database_conversions_unittest.cc

@@ -2,14 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/browser/notifications/notification_database_conversions.h"
+
 #include <stddef.h>
 #include <stdint.h>
 
-#include "base/cxx17_backports.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
-#include "content/browser/notifications/notification_database_conversions.h"
 #include "content/browser/notifications/notification_database_data.pb.h"
 #include "content/browser/notifications/notification_database_resources.pb.h"
 #include "content/public/browser/notification_database_data.h"
@@ -64,11 +64,10 @@ const bool kHasTriggered = true;
 TEST(NotificationDatabaseConversionsTest, SerializeAndDeserializeData) {
   std::vector<int> vibration_pattern(
       kNotificationVibrationPattern,
-      kNotificationVibrationPattern +
-          base::size(kNotificationVibrationPattern));
+      kNotificationVibrationPattern + std::size(kNotificationVibrationPattern));
 
   std::vector<char> developer_data(
-      kNotificationData, kNotificationData + base::size(kNotificationData));
+      kNotificationData, kNotificationData + std::size(kNotificationData));
 
   blink::PlatformNotificationData notification_data;
   notification_data.title = kNotificationTitle;
@@ -256,7 +255,7 @@ TEST(NotificationDatabaseConversionsTest, SerializeAndDeserializeDirections) {
       blink::mojom::NotificationDirection::RIGHT_TO_LEFT,
       blink::mojom::NotificationDirection::AUTO};
 
-  for (size_t i = 0; i < base::size(directions); ++i) {
+  for (size_t i = 0; i < std::size(directions); ++i) {
     blink::PlatformNotificationData notification_data;
     notification_data.direction = directions[i];
 
@@ -282,7 +281,7 @@ TEST(NotificationDatabaseConversionsTest,
       NotificationDatabaseData::ClosedReason::DEVELOPER,
       NotificationDatabaseData::ClosedReason::UNKNOWN};
 
-  for (size_t i = 0; i < base::size(closed_reasons); ++i) {
+  for (size_t i = 0; i < std::size(closed_reasons); ++i) {
     NotificationDatabaseData database_data;
     database_data.closed_reason = closed_reasons[i];
 

content/browser/ppapi_plugin_process_host.cc

@@ -12,7 +12,6 @@
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/memory/raw_ptr.h"
 #include "base/strings/string_number_conversions.h"
@@ -244,7 +243,7 @@ bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
     switches::kVModule
   };
   cmd_line->CopySwitchesFrom(browser_command_line, kCommonForwardSwitches,
-                             base::size(kCommonForwardSwitches));
+                             std::size(kCommonForwardSwitches));
 
   static const char* const kPluginForwardSwitches[] = {
     sandbox::policy::switches::kDisableSeccompFilterSandbox,
@@ -256,7 +255,7 @@ bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
     switches::kTimeZoneForTesting,
   };
   cmd_line->CopySwitchesFrom(browser_command_line, kPluginForwardSwitches,
-                             base::size(kPluginForwardSwitches));
+                             std::size(kPluginForwardSwitches));
 
   std::string locale = GetContentClient()->browser()->GetApplicationLocale();
   if (!locale.empty()) {

content/browser/renderer_host/dwrite_font_proxy_impl_win.cc

@@ -16,7 +16,6 @@
 
 #include "base/callback_helpers.h"
 #include "base/check_op.h"
-#include "base/cxx17_backports.h"
 #include "base/feature_list.h"
 #include "base/i18n/case_conversion.h"
 #include "base/metrics/histogram_functions.h"
@@ -596,7 +595,7 @@ void DWriteFontProxyImpl::InitializeDirectWrite() {
   }
 
   // Temp code to help track down crbug.com/561873
-  for (size_t font = 0; font < base::size(kLastResortFontNames); font++) {
+  for (size_t font = 0; font < std::size(kLastResortFontNames); font++) {
     uint32_t font_index = 0;
     BOOL exists = FALSE;
     if (SUCCEEDED(collection_->FindFamilyName(kLastResortFontNames[font],

content/browser/renderer_host/input/input_router_impl_unittest.cc

@@ -13,7 +13,6 @@
 #include <vector>
 
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ -1007,7 +1006,7 @@ TEST_F(InputRouterImplTest, MAYBE_GestureTypesIgnoringAck) {
       WebInputEvent::Type::kGesturePinchUpdate,
       WebInputEvent::Type::kGesturePinchEnd,
       WebInputEvent::Type::kGestureScrollEnd};
-  for (size_t i = 0; i < base::size(eventTypes); ++i) {
+  for (size_t i = 0; i < std::size(eventTypes); ++i) {
     WebInputEvent::Type type = eventTypes[i];
     if (type == WebInputEvent::Type::kGestureFlingStart ||
         type == WebInputEvent::Type::kGestureFlingCancel) {
@@ -1105,7 +1104,7 @@ TEST_F(InputRouterImplTest, RequiredEventAckTypes) {
       WebInputEvent::Type::kGestureScrollUpdate,
       WebInputEvent::Type::kTouchStart,
       WebInputEvent::Type::kTouchMove};
-  for (size_t i = 0; i < base::size(kRequiredEventAckTypes); ++i) {
+  for (size_t i = 0; i < std::size(kRequiredEventAckTypes); ++i) {
     const WebInputEvent::Type required_ack_type = kRequiredEventAckTypes[i];
     ASSERT_TRUE(ShouldBlockEventStream(GetEventWithType(required_ack_type)))
         << WebInputEvent::GetName(required_ack_type);

content/browser/renderer_host/input/motion_event_web_unittest.cc

@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/browser/renderer_host/input/motion_event_web.h"
+
 #include <stddef.h>
 
-#include "base/cxx17_backports.h"
 #include "base/numerics/math_constants.h"
-#include "content/browser/renderer_host/input/motion_event_web.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/gesture_detection/motion_event_generic.h"
@@ -33,7 +33,7 @@ TEST(MotionEventWebTest, Constructor) {
   PointerProperties pp;
   MotionEventGeneric generic_event(MotionEvent::Action::MOVE, event_time, pp);
   for (MotionEvent::ToolType tool_type : tool_types) {
-    for (size_t i = 0; i < base::size(tilts_x); ++i) {
+    for (size_t i = 0; i < std::size(tilts_x); ++i) {
       const float tilt_x = tilts_x[i];
       const float tilt_y = tilts_y[i];
       const float orientation = orientations[i];

content/browser/renderer_host/input/web_input_event_builders_mac_unittest.mm

@@ -8,7 +8,6 @@
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
-#include "base/cxx17_backports.h"
 #include "base/mac/mac_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "ui/events/cocoa/cocoa_event_utils.h"
@@ -187,7 +186,7 @@ TEST(WebInputEventBuilderMacTest, NumPadMapping) {
        ui::DomKey::FromCharacter('9')},
   };
 
-  for (size_t i = 0; i < base::size(table); ++i) {
+  for (size_t i = 0; i < std::size(table); ++i) {
     NSEvent* mac_event = BuildFakeKeyEvent(table[i].mac_key_code,
                                            table[i].character, 0, NSKeyDown);
     WebKeyboardEvent web_event = WebKeyboardEventBuilder::Build(mac_event);
@@ -200,7 +199,7 @@ TEST(WebInputEventBuilderMacTest, NumPadMapping) {
 // Test that left- and right-hand modifier keys are interpreted correctly when
 // pressed simultaneously.
 TEST(WebInputEventFactoryTestMac, SimultaneousModifierKeys) {
-  for (size_t i = 0; i < base::size(kModifierKeys) / 2; ++i) {
+  for (size_t i = 0; i < std::size(kModifierKeys) / 2; ++i) {
     const ModifierKey& left = kModifierKeys[2 * i];
     const ModifierKey& right = kModifierKeys[2 * i + 1];
     // Press the left key.
@@ -231,7 +230,7 @@ TEST(WebInputEventFactoryTestMac, SimultaneousModifierKeys) {
 // Test that individual modifier keys are still reported correctly, even if the
 // undocumented left- or right-hand flags are not set.
 TEST(WebInputEventBuilderMacTest, MissingUndocumentedModifierFlags) {
-  for (size_t i = 0; i < base::size(kModifierKeys); ++i) {
+  for (size_t i = 0; i < std::size(kModifierKeys); ++i) {
     const ModifierKey& key = kModifierKeys[i];
     NSEvent* mac_event = BuildFakeKeyEvent(
         key.mac_key_code, 0, key.non_specific_mask, NSFlagsChanged);

content/browser/renderer_host/media/media_stream_manager.cc

@@ -16,7 +16,6 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
-#include "base/cxx17_backports.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ -129,8 +128,8 @@ std::string RandomLabel() {
   static const size_t kRfc4122LengthLabel = 36u;
   std::string label(kRfc4122LengthLabel, ' ');
   for (char& c : label) {
-    // Use |base::size(kAlphabet) - 1| to avoid |kAlphabet|s terminating '\0';
-    c = kAlphabet[base::RandGenerator(base::size(kAlphabet) - 1)];
+    // Use |std::size(kAlphabet) - 1| to avoid |kAlphabet|s terminating '\0';
+    c = kAlphabet[base::RandGenerator(std::size(kAlphabet) - 1)];
     DCHECK(std::isalnum(c)) << c;
   }
   return label;
@@ -2338,7 +2337,7 @@ void MediaStreamManager::DevicesEnumerated(
   bool requested[] = {requested_audio_input, requested_video_input};
   MediaStreamType stream_types[] = {MediaStreamType::DEVICE_AUDIO_CAPTURE,
                                     MediaStreamType::DEVICE_VIDEO_CAPTURE};
-  for (size_t i = 0; i < base::size(requested); ++i) {
+  for (size_t i = 0; i < std::size(requested); ++i) {
     if (!requested[i])
       continue;
 

content/browser/renderer_host/navigator_unittest.cc

@@ -6,7 +6,6 @@
 
 #include <stdint.h>
 
-#include "base/cxx17_backports.h"
 #include "base/feature_list.h"
 #include "base/test/test_simple_task_runner.h"
 #include "base/time/time.h"
@@ -572,7 +571,7 @@ TEST_F(NavigatorTest, NoContent) {
   auto response = network::mojom::URLResponseHead::New();
   const char kNoContentHeaders[] = "HTTP/1.1 204 No Content\0\0";
   response->headers = new net::HttpResponseHeaders(
-      std::string(kNoContentHeaders, base::size(kNoContentHeaders)));
+      std::string(kNoContentHeaders, std::size(kNoContentHeaders)));
   GetLoaderForNavigationRequest(main_request)
       ->CallOnResponseStarted(std::move(response),
                               mojo::ScopedDataPipeConsumerHandle());
@@ -597,7 +596,7 @@ TEST_F(NavigatorTest, NoContent) {
   response = network::mojom::URLResponseHead::New();
   const char kResetContentHeaders[] = "HTTP/1.1 205 Reset Content\0\0";
   response->headers = new net::HttpResponseHeaders(
-      std::string(kResetContentHeaders, base::size(kResetContentHeaders)));
+      std::string(kResetContentHeaders, std::size(kResetContentHeaders)));
   GetLoaderForNavigationRequest(main_request)
       ->CallOnResponseStarted(std::move(response),
                               mojo::ScopedDataPipeConsumerHandle());

content/browser/renderer_host/pepper/pepper_truetype_font_list_mac.mm

@@ -6,7 +6,6 @@
 
 #import <Cocoa/Cocoa.h>
 
-#include "base/cxx17_backports.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ppapi/c/dev/ppb_truetype_font_dev.h"
 #include "ppapi/proxy/serialized_structs.h"
@@ -30,7 +29,7 @@ const PP_TrueTypeFontWeight_Dev kPepperFontWeights[] = {
     PP_TRUETYPEFONTWEIGHT_ULTRABOLD,
     PP_TRUETYPEFONTWEIGHT_HEAVY,
 };
-const NSInteger kPepperFontWeightsLength = base::size(kPepperFontWeights);
+const NSInteger kPepperFontWeightsLength = std::size(kPepperFontWeights);
 
 }  // namespace
 

content/browser/renderer_host/render_process_host_impl.cc

@@ -3501,7 +3501,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
 #endif
   };
   renderer_cmd->CopySwitchesFrom(browser_cmd, kSwitchNames,
-                                 base::size(kSwitchNames));
+                                 std::size(kSwitchNames));
 
   // |switches::kGaiaConfig| can be set via browser command-line arguments,
   // usually by developers working on signin code. The switch, however, cannot

content/browser/renderer_host/render_widget_host_view_mac_editcommand_helper.mm

@@ -7,7 +7,6 @@
 #import <objc/runtime.h>
 #include <stddef.h>
 
-#include "base/cxx17_backports.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #import "content/browser/renderer_host/render_widget_host_view_mac.h"
 
@@ -180,7 +179,7 @@ NSString* RenderWidgetHostViewMacEditCommandHelper::CommandNameForSelector(
 
 RenderWidgetHostViewMacEditCommandHelper::
     RenderWidgetHostViewMacEditCommandHelper() {
-  for (size_t i = 0; i < base::size(kEditCommands); ++i) {
+  for (size_t i = 0; i < std::size(kEditCommands); ++i) {
     edit_command_set_.insert(kEditCommands[i]);
   }
 }
@@ -213,7 +212,7 @@ bool RenderWidgetHostViewMacEditCommandHelper::IsMenuItemEnabled(
 // static
 void RenderWidgetHostViewMacEditCommandHelper::AddEditingSelectorsToClass(
     Class klass) {
-  for (size_t i = 0; i < base::size(kEditCommands); ++i) {
+  for (size_t i = 0; i < std::size(kEditCommands); ++i) {
     // Append trailing ':' to command name to get selector name.
     NSString* sel_str = [NSString stringWithFormat:@"%s:", kEditCommands[i]];
 
@@ -230,7 +229,7 @@ void RenderWidgetHostViewMacEditCommandHelper::AddEditingSelectorsToClass(
 // static
 NSArray*
 RenderWidgetHostViewMacEditCommandHelper::GetEditSelectorNamesForTesting() {
-  size_t num_edit_commands = base::size(kEditCommands);
+  size_t num_edit_commands = std::size(kEditCommands);
   NSMutableArray* ret = [NSMutableArray arrayWithCapacity:num_edit_commands];
 
   for (size_t i = 0; i < num_edit_commands; ++i) {

content/browser/sandbox_ipc_linux.cc

@@ -13,7 +13,6 @@
 #include <sys/stat.h>
 
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/files/scoped_file.h"
 #include "base/linux_util.h"
 #include "base/logging.h"
@@ -44,7 +43,7 @@ void SandboxIPCHandler::Run() {
   int failed_polls = 0;
   for (;;) {
     const int r =
-        HANDLE_EINTR(poll(pfds, base::size(pfds), -1 /* no timeout */));
+        HANDLE_EINTR(poll(pfds, std::size(pfds), -1 /* no timeout */));
     // '0' is not a possible return value with no timeout.
     DCHECK_NE(0, r);
     if (r < 0) {

content/browser/service_process_host_browsertest.cc

@@ -2,16 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/public/browser/service_process_host.h"
+
 #include <string.h>
 
-#include "base/cxx17_backports.h"
 #include "base/memory/shared_memory_mapping.h"
 #include "base/memory/unsafe_shared_memory_region.h"
 #include "base/run_loop.h"
 #include "base/test/bind.h"
 #include "base/time/time.h"
 #include "base/timer/elapsed_timer.h"
-#include "content/public/browser/service_process_host.h"
 #include "content/public/test/browser_test.h"
 #include "content/public/test/content_browser_test.h"
 #include "services/test/echo/public/mojom/echo.mojom.h"
@@ -121,7 +121,7 @@ IN_PROC_BROWSER_TEST_F(ServiceProcessHostBrowserTest, AllMessagesReceived) {
   echo_service.reset();
   observer.WaitForDeath();
 
-  const std::string& kLastMessage = kMessages[base::size(kMessages) - 1];
+  const std::string& kLastMessage = kMessages[std::size(kMessages) - 1];
   EXPECT_EQ(0,
             memcmp(mapping.memory(), kLastMessage.data(), kLastMessage.size()));
 }

content/browser/service_worker/embedded_worker_test_helper.cc

@@ -183,7 +183,7 @@ EmbeddedWorkerTestHelper::CreateMainScriptResponse() {
       "Content-Type: application/javascript\0"
       "\0";
   response_head.headers = base::MakeRefCounted<net::HttpResponseHeaders>(
-      std::string(data, base::size(data)));
+      std::string(data, std::size(data)));
   return std::make_unique<ServiceWorkerVersion::MainScriptResponse>(
       response_head);
 }

content/browser/service_worker/service_worker_cache_writer_unittest.cc

@@ -13,7 +13,6 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/containers/queue.h"
-#include "base/cxx17_backports.h"
 #include "base/memory/ptr_util.h"
 #include "base/test/task_environment.h"
 #include "content/browser/service_worker/service_worker_test_utils.h"
@@ -169,7 +168,7 @@ class ServiceWorkerCacheWriterTest : public ::testing::Test {
     auto response_head = network::mojom::URLResponseHead::New();
     const char data[] = "HTTP/1.1 200 OK\0\0";
     response_head->headers = base::MakeRefCounted<net::HttpResponseHeaders>(
-        std::string(data, base::size(data)));
+        std::string(data, std::size(data)));
     response_head->content_length = len;
     net::Error error = cache_writer_->MaybeWriteHeaders(
         std::move(response_head), CreateWriteCallback());

content/browser/service_worker/service_worker_file_upload_browsertest.cc

@@ -59,7 +59,7 @@ void ExpectEqual(const base::DictionaryValue& expected,
 }
 
 const char kFileContent[] = "uploaded file content";
-const size_t kFileSize = base::size(kFileContent) - 1;
+const size_t kFileSize = std::size(kFileContent) - 1;
 }  // namespace
 
 // Tests POST requests that include a file and are intercepted by a service

content/browser/service_worker/service_worker_job_unittest.cc

@@ -11,7 +11,6 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/check.h"
-#include "base/cxx17_backports.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/raw_ptr.h"
 #include "base/run_loop.h"
@@ -1285,7 +1284,7 @@ void WriteStringResponse(
     const std::string& body) {
   mojo_base::BigBuffer body_buffer(base::as_bytes(base::make_span(body)));
   const char kHttpHeaders[] = "HTTP/1.0 200 HONKYDORY\0\0";
-  std::string headers(kHttpHeaders, base::size(kHttpHeaders));
+  std::string headers(kHttpHeaders, std::size(kHttpHeaders));
   WriteResponse(writer, headers, std::move(body_buffer));
 }
 
@@ -1426,13 +1425,13 @@ class UpdateJobTestHelper : public EmbeddedWorkerTestHelper,
       // Spoof caching the script for the initial version.
       WriteStringResponse(writer, kBody);
       version->script_cache_map()->NotifyFinishedCaching(
-          script, base::size(kBody), net::OK, std::string());
+          script, std::size(kBody), net::OK, std::string());
     } else {
       EXPECT_NE(GURL(kNoChangeOrigin), script.DeprecatedGetOriginAsURL());
       // The script must be changed.
       WriteStringResponse(writer, kNewBody);
       version->script_cache_map()->NotifyFinishedCaching(
-          script, base::size(kNewBody), net::OK, std::string());
+          script, std::size(kNewBody), net::OK, std::string());
     }
 
     version->SetMainScriptResponse(CreateMainScriptResponse());
@@ -1850,7 +1849,7 @@ TEST_F(ServiceWorkerUpdateJobTest, Update_ScriptUrlChanged) {
   version->script_cache_map()->NotifyStartedCaching(new_script, resource_id);
   WriteStringResponse(writer, kBody);
   version->script_cache_map()->NotifyFinishedCaching(
-      new_script, base::size(kBody), net::OK, std::string());
+      new_script, std::size(kBody), net::OK, std::string());
 
   // Run the update job.
   base::RunLoop().RunUntilIdle();

content/browser/service_worker/service_worker_registry_unittest.cc

@@ -129,7 +129,7 @@ int WriteBasicResponse(
     int64_t id) {
   const char kHttpHeaders[] = "HTTP/1.0 200 HONKYDORY\0Content-Length: 5\0\0";
   const char kHttpBody[] = "Hello";
-  std::string headers(kHttpHeaders, base::size(kHttpHeaders));
+  std::string headers(kHttpHeaders, std::size(kHttpHeaders));
   return WriteStringResponse(storage, id, headers, std::string(kHttpBody));
 }
 

content/browser/service_worker/service_worker_version_browsertest.cc

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/browser/service_worker/service_worker_version.h"
+
 #include <stddef.h>
 #include <stdint.h>
 
@@ -13,7 +15,6 @@
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
-#include "base/cxx17_backports.h"
 #include "base/memory/raw_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/metrics/statistics_recorder.h"
@@ -36,7 +37,6 @@
 #include "content/browser/service_worker/service_worker_host.h"
 #include "content/browser/service_worker/service_worker_registration.h"
 #include "content/browser/service_worker/service_worker_test_utils.h"
-#include "content/browser/service_worker/service_worker_version.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
@@ -216,7 +216,7 @@ CreateMainScriptResponse() {
       "Content-Type: application/javascript\0"
       "\0";
   response_head.headers =
-      new net::HttpResponseHeaders(std::string(data, base::size(data)));
+      new net::HttpResponseHeaders(std::string(data, std::size(data)));
   return std::make_unique<ServiceWorkerVersion::MainScriptResponse>(
       response_head);
 }

content/browser/storage_partition_impl_unittest.cc

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/browser/storage_partition_impl.h"
+
 #include <stddef.h>
 #include <stdint.h>
 
@@ -16,7 +18,6 @@
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/containers/contains.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
@@ -50,7 +51,6 @@
 #include "content/browser/code_cache/generated_code_cache_context.h"
 #include "content/browser/gpu/shader_cache_factory.h"
 #include "content/browser/interest_group/interest_group_manager_impl.h"
-#include "content/browser/storage_partition_impl.h"
 #include "content/public/browser/browser_task_traits.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/generated_code_cache_settings.h"
@@ -392,8 +392,8 @@ class RemoveLocalStorageTester {
     std::vector<uint8_t> serialized_origin(origin_str.begin(),
                                            origin_str.end());
     std::vector<uint8_t> key;
-    key.reserve(base::size(kMetaPrefix) + serialized_origin.size());
-    key.insert(key.end(), kMetaPrefix, kMetaPrefix + base::size(kMetaPrefix));
+    key.reserve(std::size(kMetaPrefix) + serialized_origin.size());
+    key.insert(key.end(), kMetaPrefix, kMetaPrefix + std::size(kMetaPrefix));
     key.insert(key.end(), serialized_origin.begin(), serialized_origin.end());
     return key;
   }

content/browser/utility_process_host.cc

@@ -11,7 +11,6 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/i18n/base_i18n_switches.h"
 #include "base/strings/utf_string_conversions.h"
@@ -299,7 +298,7 @@ bool UtilityProcessHost::StartProcess() {
 #endif
     };
     cmd_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
-                               base::size(kSwitchNames));
+                               std::size(kSwitchNames));
 
     network_session_configurator::CopyNetworkSwitches(browser_command_line,
                                                       cmd_line.get());

content/browser/web_package/signed_exchange_subresource_prefetch_browsertest.cc

@@ -5,7 +5,6 @@
 #include <string>
 #include <vector>
 
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/format_macros.h"
@@ -1997,7 +1996,7 @@ IN_PROC_BROWSER_TEST_F(SignedExchangeSubresourcePrefetchBrowserTest, CORS) {
   std::string requests_list_string;
 
   std::vector<MockSignedExchangeHandlerParams> mock_params;
-  for (size_t i = 0; i < base::size(kTestCases); ++i) {
+  for (size_t i = 0; i < std::size(kTestCases); ++i) {
     if (i) {
       target_sxg_outer_link_header += ",";
       target_sxg_inner_link_header += ",";
@@ -2083,7 +2082,7 @@ let results = [];
       NavigateToURL(shell(), embedded_test_server()->GetURL(prefetch_path)));
 
   // Wait until all (main- and sub-resource) SXGs are prefetched.
-  while (GetCachedExchanges(shell()).size() < base::size(kTestCases) + 1) {
+  while (GetCachedExchanges(shell()).size() < std::size(kTestCases) + 1) {
     base::RunLoop run_loop;
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, run_loop.QuitClosure(), TestTimeouts::tiny_timeout());
@@ -2092,7 +2091,7 @@ let results = [];
 
   NavigateToURLAndWaitTitle(target_sxg_url, "done");
 
-  for (size_t i = 0; i < base::size(kTestCases); ++i) {
+  for (size_t i = 0; i < std::size(kTestCases); ++i) {
     SCOPED_TRACE(base::StringPrintf("TestCase %zu", i));
     EXPECT_EQ(
         EvalJs(shell(), base::StringPrintf("results[%zu]", i)).ExtractString(),

content/browser/webauth/authenticator_impl_unittest.cc

@@ -15,7 +15,6 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/compiler_specific.h"
-#include "base/cxx17_backports.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/raw_ptr.h"
@@ -794,10 +793,10 @@ TEST_F(AuthenticatorImplTest, ClientDataJSONSerialization) {
 TEST_F(AuthenticatorImplTest, MakeCredentialOriginAndRpIds) {
   std::vector<OriginClaimedAuthorityPair> tests(
       &kValidRelyingPartyTestCases[0],
-      &kValidRelyingPartyTestCases[base::size(kValidRelyingPartyTestCases)]);
-  tests.insert(tests.end(), &kInvalidRelyingPartyTestCases[0],
-               &kInvalidRelyingPartyTestCases[base::size(
-                   kInvalidRelyingPartyTestCases)]);
+      &kValidRelyingPartyTestCases[std::size(kValidRelyingPartyTestCases)]);
+  tests.insert(
+      tests.end(), &kInvalidRelyingPartyTestCases[0],
+      &kInvalidRelyingPartyTestCases[std::size(kInvalidRelyingPartyTestCases)]);
 
   for (const auto& test_case : tests) {
     SCOPED_TRACE(std::string(test_case.claimed_authority) + " " +

content/browser/webui/web_ui_data_source_unittest.cc

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/webui/web_ui_data_source_impl.h"
@@ -39,13 +38,13 @@ class TestClient : public TestContentClient {
     base::RefCountedStaticMemory* bytes = nullptr;
     if (resource_id == kDummyDefaultResourceId) {
       bytes = new base::RefCountedStaticMemory(
-          kDummyDefaultResource, base::size(kDummyDefaultResource));
+          kDummyDefaultResource, std::size(kDummyDefaultResource));
     } else if (resource_id == kDummyResourceId) {
       bytes = new base::RefCountedStaticMemory(kDummyResource,
-                                               base::size(kDummyResource));
+                                               std::size(kDummyResource));
     } else if (resource_id == kDummyJSResourceId) {
       bytes = new base::RefCountedStaticMemory(kDummyJSResource,
-                                               base::size(kDummyJSResource));
+                                               std::size(kDummyJSResource));
     }
     return bytes;
   }

content/common/font_list_fontconfig.cc

@@ -2,17 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/common/font_list.h"
+#include <fontconfig/fontconfig.h>
 
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
 
-#include <fontconfig/fontconfig.h>
-
-#include "base/cxx17_backports.h"
 #include "base/values.h"
+#include "content/common/font_list.h"
 
 namespace content {
 
@@ -39,7 +37,7 @@ std::unique_ptr<base::ListValue> GetFontList_SlowBlocking() {
   // See https://www.freetype.org/freetype2/docs/reference/ft2-font_formats.html
   // for the list of possible formats.
   const char* allowed_formats[] = { "TrueType", "CFF" };
-  for (size_t i = 0; i < base::size(allowed_formats); ++i) {
+  for (size_t i = 0; i < std::size(allowed_formats); ++i) {
     auto format_pattern = CreateFormatPattern(allowed_formats[i]);
     std::unique_ptr<FcFontSet, decltype(&FcFontSetDestroy)> fontset(
         FcFontList(nullptr, format_pattern.get(), object_set.get()),

content/common/font_list_mac.mm

@@ -165,7 +165,7 @@ class FontFamilyResolver {
     CFStringRef set_values[] = {kCTFontFamilyNameAttribute};
     return base::ScopedCFTypeRef<CFSetRef>(CFSetCreate(
         kCFAllocatorDefault, reinterpret_cast<const void**>(set_values),
-        base::size(set_values), &kCFTypeSetCallBacks));
+        std::size(set_values), &kCFTypeSetCallBacks));
   }
 
   // Creates the mutable dictionary stored in |font_descriptor_attributes_|.

content/common/webplugininfo_unittest.cc

@@ -10,7 +10,6 @@
 #include <string>
 #include <vector>
 
-#include "base/cxx17_backports.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/version.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -33,7 +32,7 @@ TEST(PluginUtilsTest, VersionExtraction) {
     { "1..0", "1.0.0" }                // Empty version component
   };
 
-  for (size_t i = 0; i < base::size(versions); i++) {
+  for (size_t i = 0; i < std::size(versions); i++) {
     base::Version version;
     WebPluginInfo::CreateVersionFromString(
         base::ASCIIToUTF16(versions[i][0]), &version);

content/common/zygote/zygote_communication_linux.cc

@@ -9,7 +9,6 @@
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/i18n/unicodestring.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_functions.h"
@@ -245,7 +244,7 @@ void ZygoteCommunication::Init(
       sandbox::policy::switches::kNoSandbox,
   };
   cmd_line.CopySwitchesFrom(browser_command_line, kForwardSwitches,
-                            base::size(kForwardSwitches));
+                            std::size(kForwardSwitches));
 
   pid_ = std::move(launcher).Run(&cmd_line, &control_fd_);
 

content/renderer/java/gin_java_bridge_value_converter_unittest.cc

@@ -9,7 +9,6 @@
 #include <cmath>
 #include <memory>
 
-#include "base/cxx17_backports.h"
 #include "base/strings/stringprintf.h"
 #include "content/common/android/gin_java_bridge_value.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -130,7 +129,7 @@ TEST_F(GinJavaBridgeValueConverterTest, TypedArrays) {
     "4", "Int32Array", "4", "Uint32Array",
     "4", "Float32Array", "8", "Float64Array"
   };
-  for (size_t i = 0; i < base::size(array_types); i += 2) {
+  for (size_t i = 0; i < std::size(array_types); i += 2) {
     const char* typed_array_type = array_types[i + 1];
     v8::Local<v8::Script> script(
         v8::Script::Compile(

content/renderer/pepper/pepper_audio_encoder_host.cc

@@ -5,10 +5,10 @@
 #include "content/renderer/pepper/pepper_audio_encoder_host.h"
 
 #include <stddef.h>
+
 #include <utility>
 
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/memory/unsafe_shared_memory_region.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "content/renderer/pepper/host_globals.h"
@@ -95,7 +95,7 @@ PepperAudioEncoderHost::AudioEncoderImpl::GetSupportedProfiles() {
   std::vector<PP_AudioProfileDescription> profiles;
   static const uint32_t sampling_rates[] = {8000, 12000, 16000, 24000, 48000};
 
-  for (uint32_t i = 0; i < base::size(sampling_rates); ++i) {
+  for (uint32_t i = 0; i < std::size(sampling_rates); ++i) {
     PP_AudioProfileDescription profile;
     profile.profile = PP_AUDIOPROFILE_OPUS;
     profile.max_channels = 2;

content/renderer/pepper/pepper_graphics_2d_host_unittest.cc

@@ -6,7 +6,6 @@
 
 #include <stddef.h>
 
-#include "base/cxx17_backports.h"
 #include "base/test/task_environment.h"
 #include "content/public/renderer/ppapi_gfx_conversion.h"
 #include "content/renderer/pepper/mock_renderer_ppapi_host.h"
@@ -136,7 +135,7 @@ TEST_F(PepperGraphics2DHostTest, ConvertToLogicalPixels) {
                // Check negative scroll deltas
                {10, 10, 20, 20, 5, 5, 10, 10, -6, -4, -3, -2, 0.5, true},
                {10, 10, 20, 20, 5, 5, 10, 10, -6, -3, -3, -1, 0.5, false}, };
-  for (size_t i = 0; i < base::size(tests); ++i) {
+  for (size_t i = 0; i < std::size(tests); ++i) {
     gfx::Rect r1(tests[i].x1, tests[i].y1, tests[i].w1, tests[i].h1);
     gfx::Rect r2(tests[i].x2, tests[i].y2, tests[i].w2, tests[i].h2);
     gfx::Rect orig = r1;

content/renderer/render_view_browsertest.cc

@@ -12,7 +12,6 @@
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/location.h"
@@ -162,7 +161,7 @@ int ConvertMockKeyboardModifier(MockKeyboard::Modifiers modifiers) {
       {MockKeyboard::RIGHT_ALT, ui::EF_ALT_DOWN},
   };
   int flags = 0;
-  for (size_t i = 0; i < base::size(kModifierMap); ++i) {
+  for (size_t i = 0; i < std::size(kModifierMap); ++i) {
     if (kModifierMap[i].src & modifiers) {
       flags |= kModifierMap[i].dst;
     }
@@ -712,7 +711,7 @@ TEST_F(RenderViewImplTest, OnNavigationHttpPost) {
 
   // Set up post data.
   const char raw_data[] = "post \0\ndata";
-  const size_t length = base::size(raw_data);
+  const size_t length = std::size(raw_data);
   scoped_refptr<network::ResourceRequestBody> post_data(
       new network::ResourceRequestBody);
   post_data->AppendBytes(raw_data, length);
@@ -894,7 +893,7 @@ TEST_F(RenderViewImplTest, BeginNavigationHandlesAllTopLevel) {
       blink::kWebNavigationTypeOther,
   };
 
-  for (size_t i = 0; i < base::size(kNavTypes); ++i) {
+  for (size_t i = 0; i < std::size(kNavTypes); ++i) {
     auto navigation_info = std::make_unique<blink::WebNavigationInfo>();
     navigation_info->url_request = blink::WebURLRequest(GURL("http://foo.com"));
     navigation_info->url_request.SetRequestorOrigin(
@@ -1368,7 +1367,7 @@ TEST_F(RenderViewImplTextInputStateChanged, OnImeTypeChanged) {
     input_mode = updated_states()[0]->mode;
     EXPECT_EQ(ui::TEXT_INPUT_TYPE_PASSWORD, type);
 
-    for (size_t test = 0; test < base::size(kInputModeTestCases); test++) {
+    for (size_t test = 0; test < std::size(kInputModeTestCases); test++) {
       const InputModeTestCase* test_case = &kInputModeTestCases[test];
       std::u16string javascript = base::ASCIIToUTF16(base::StringPrintf(
           "document.getElementById('%s').focus();", test_case->input_id));
@@ -1943,7 +1942,7 @@ TEST_F(RenderViewImplTest, ImeComposition) {
       {IME_FINISHCOMPOSINGTEXT, false, -1, -1, L"", L"\xC548\xB155"},
   };
 
-  for (size_t i = 0; i < base::size(kImeMessages); i++) {
+  for (size_t i = 0; i < std::size(kImeMessages); i++) {
     const ImeMessage* ime_message = &kImeMessages[i];
     switch (ime_message->command) {
       case IME_INITIALIZE:

content/services/auction_worklet/auction_v8_helper_unittest.cc

@@ -8,7 +8,6 @@
 #include <string>
 #include <vector>
 
-#include "base/cxx17_backports.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/lock.h"
 #include "base/test/bind.h"
@@ -1266,13 +1265,12 @@ TEST_F(AuctionV8HelperTest, CompileWasm) {
 
   v8::Local<v8::WasmModuleObject> wasm_module;
   absl::optional<std::string> compile_error;
-  ASSERT_TRUE(
-      helper_
-          ->CompileWasm(std::string(kMinimalWasmModuleBytes,
-                                    base::size(kMinimalWasmModuleBytes)),
-                        GURL("https://foo.test/"),
-                        /*debug_id=*/nullptr, compile_error)
-          .ToLocal(&wasm_module));
+  ASSERT_TRUE(helper_
+                  ->CompileWasm(std::string(kMinimalWasmModuleBytes,
+                                            std::size(kMinimalWasmModuleBytes)),
+                                GURL("https://foo.test/"),
+                                /*debug_id=*/nullptr, compile_error)
+                  .ToLocal(&wasm_module));
   EXPECT_FALSE(compile_error.has_value());
 }
 
@@ -1317,7 +1315,7 @@ TEST_F(AuctionV8HelperTest, CompileWasmDebug) {
   absl::optional<std::string> error_out;
   EXPECT_TRUE(CompileWasmOnV8ThreadAndWait(
       id, GURL("https://example.com"),
-      std::string(kMinimalWasmModuleBytes, base::size(kMinimalWasmModuleBytes)),
+      std::string(kMinimalWasmModuleBytes, std::size(kMinimalWasmModuleBytes)),
       &error_out));
   TestDevToolsAgentClient::Event script_parsed =
       debug_client.WaitForMethodNotification("Debugger.scriptParsed");
@@ -1348,13 +1346,12 @@ TEST_F(AuctionV8HelperTest, CloneWasmModule) {
   // Compile the WASM module...
   v8::Local<v8::WasmModuleObject> wasm_module;
   absl::optional<std::string> error_msg;
-  ASSERT_TRUE(
-      helper_
-          ->CompileWasm(std::string(kMinimalWasmModuleBytes,
-                                    base::size(kMinimalWasmModuleBytes)),
-                        GURL("https://foo.test/"),
-                        /*debug_id=*/nullptr, error_msg)
-          .ToLocal(&wasm_module));
+  ASSERT_TRUE(helper_
+                  ->CompileWasm(std::string(kMinimalWasmModuleBytes,
+                                            std::size(kMinimalWasmModuleBytes)),
+                                GURL("https://foo.test/"),
+                                /*debug_id=*/nullptr, error_msg)
+                  .ToLocal(&wasm_module));
   EXPECT_FALSE(error_msg.has_value());
 
   // And the test script.

content/services/auction_worklet/auction_v8_inspector_util_unittest.cc

@@ -9,7 +9,6 @@
 #include <string>
 #include <vector>
 
-#include "base/cxx17_backports.h"
 #include "testing/gmock/include/gmock/gmock-matchers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "v8/include/v8-inspector.h"
@@ -21,7 +20,7 @@ namespace auction_worklet {
 TEST(AuctionV8InspectorUtilTest, GetStringBytes8) {
   const uint8_t chars[] = {'a', 'b', 'c', 0xD0, 0xB0, 0xD0, 0xB1, 0xD0, 0xB2};
   auto string_buf = v8_inspector::StringBuffer::create(
-      v8_inspector::StringView(chars, base::size(chars)));
+      v8_inspector::StringView(chars, std::size(chars)));
   EXPECT_THAT(GetStringBytes(string_buf.get()),
               ElementsAre('a', 'b', 'c', 0xD0, 0xB0, 0xD0, 0xB1, 0xD0, 0xB2));
 }
@@ -36,7 +35,7 @@ TEST(AuctionV8InspectorUtilTest, GetStringBytes16) {
                               // U+1F600, GRINNING FACE, as surrogate pairs.
                               0xD83D, 0xDE00};
   auto string_buf = v8_inspector::StringBuffer::create(
-      v8_inspector::StringView(chars16, base::size(chars16)));
+      v8_inspector::StringView(chars16, std::size(chars16)));
   EXPECT_THAT(GetStringBytes(string_buf.get()),
               ElementsAre(0xD0, 0x94, 0xD1, 0x8F, 0xD0, 0xBA, 0xD1, 0x83, 0xD1,
                           0x8E, '!', 0xF0, 0x9F, 0x98, 0x80));

content/services/auction_worklet/bidder_worklet.cc

@@ -13,7 +13,6 @@
 
 #include "base/bind.h"
 #include "base/callback.h"
-#include "base/cxx17_backports.h"
 #include "base/logging.h"
 #include "base/memory/scoped_refptr.h"
 #include "base/strings/strcat.h"
@@ -92,7 +91,7 @@ v8::MaybeLocal<v8::Value> CreatePrevWinsArray(
       return v8::MaybeLocal<v8::Value>();
     }
     prev_wins_v8.push_back(
-        v8::Array::New(isolate, win_values, base::size(win_values)));
+        v8::Array::New(isolate, win_values, std::size(win_values)));
   }
   return v8::Array::New(isolate, prev_wins_v8.data(), prev_wins_v8.size());
 }

content/services/auction_worklet/bidder_worklet_unittest.cc

@@ -9,7 +9,6 @@
 #include <vector>
 
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/feature_list.h"
 #include "base/memory/raw_ptr.h"
 #include "base/run_loop.h"
@@ -58,7 +57,7 @@ const char kWasmUrl[] = "https://foo.test/helper.wasm";
 // Packs kToyWasm into a std::string.
 std::string ToyWasm() {
   return std::string(reinterpret_cast<const char*>(kToyWasm),
-                     base::size(kToyWasm));
+                     std::size(kToyWasm));
 }
 
 // Creates generateBid() scripts with the specified result value, in raw

content/services/auction_worklet/worklet_loader_unittest.cc

@@ -8,7 +8,6 @@
 #include <utility>
 
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/run_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/bind.h"
@@ -233,10 +232,10 @@ TEST_F(WorkletLoaderTest, DeleteBeforeCallback) {
 }
 
 TEST_F(WorkletLoaderTest, LoadWasmSuccess) {
-  AddResponse(&url_loader_factory_, url_, "application/wasm",
-              /*charset=*/absl::nullopt,
-              std::string(kMinimalWasmModuleBytes,
-                          base::size(kMinimalWasmModuleBytes)));
+  AddResponse(
+      &url_loader_factory_, url_, "application/wasm",
+      /*charset=*/absl::nullopt,
+      std::string(kMinimalWasmModuleBytes, std::size(kMinimalWasmModuleBytes)));
   WorkletWasmLoader worklet_loader(
       &url_loader_factory_, url_, v8_helper_,
       scoped_refptr<AuctionV8Helper::DebugId>(),

content/shell/browser/shell_content_browser_client.cc

@@ -5,11 +5,11 @@
 #include "content/shell/browser/shell_content_browser_client.h"
 
 #include <stddef.h>
+
 #include <utility>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/feature_list.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
@@ -302,8 +302,7 @@ void ShellContentBrowserClient::AppendExtraCommandLineSwitches(
   };
 
   command_line->CopySwitchesFrom(*base::CommandLine::ForCurrentProcess(),
-                                 kForwardSwitches,
-                                 base::size(kForwardSwitches));
+                                 kForwardSwitches, std::size(kForwardSwitches));
 
 #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(

content/shell/browser/shell_download_manager_delegate.cc

@@ -167,7 +167,7 @@ void ShellDownloadManagerDelegate::ChooseDownloadPath(
 #if BUILDFLAG(IS_WIN)
   std::wstring file_part = base::FilePath(suggested_path).BaseName().value();
   wchar_t file_name[MAX_PATH];
-  base::wcslcpy(file_name, file_part.c_str(), base::size(file_name));
+  base::wcslcpy(file_name, file_part.c_str(), std::size(file_name));
   OPENFILENAME save_as;
   ZeroMemory(&save_as, sizeof(save_as));
   save_as.lStructSize = sizeof(OPENFILENAME);
@@ -178,7 +178,7 @@ void ShellDownloadManagerDelegate::ChooseDownloadPath(
   save_as.hwndOwner =
       web_contents->GetNativeView()->GetHost()->GetAcceleratedWidget();
   save_as.lpstrFile = file_name;
-  save_as.nMaxFile = base::size(file_name);
+  save_as.nMaxFile = std::size(file_name);
 
   std::wstring directory;
   if (!suggested_path.empty())

content/shell/browser/shell_platform_delegate_views.cc

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/memory/raw_ptr.h"
-#include "content/shell/browser/shell_platform_delegate.h"
-
 #include <stddef.h>
 
 #include <algorithm>
@@ -13,7 +10,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/contains.h"
-#include "base/cxx17_backports.h"
+#include "base/memory/raw_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "build/chromeos_buildflags.h"
@@ -21,6 +18,7 @@
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/shell/browser/shell.h"
+#include "content/shell/browser/shell_platform_delegate.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
@@ -241,7 +239,7 @@ class ShellView : public views::BoxLayoutView,
     DCHECK(GetWidget());
     static const ui::KeyboardCode keys[] = {ui::VKEY_F5, ui::VKEY_BROWSER_BACK,
                                             ui::VKEY_BROWSER_FORWARD};
-    for (size_t i = 0; i < base::size(keys); ++i) {
+    for (size_t i = 0; i < std::size(keys); ++i) {
       GetFocusManager()->RegisterAccelerator(
           ui::Accelerator(keys[i], ui::EF_NONE),
           ui::AcceleratorManager::kNormalPriority, this);

content/test/content_browser_test_test.cc

@@ -66,7 +66,7 @@ base::CommandLine CreateCommandLine() {
       switches::kOzonePlatform,
   };
   command_line.CopySwitchesFrom(cmdline, kSwitchesToCopy,
-                                base::size(kSwitchesToCopy));
+                                std::size(kSwitchesToCopy));
 #endif
   return command_line;
 }

content/test/mock_keyboard_driver_win.cc

@@ -8,7 +8,6 @@
 #include <string.h>
 
 #include "base/check.h"
-#include "base/cxx17_backports.h"
 #include "content/test/mock_keyboard.h"
 
 namespace content {
@@ -103,7 +102,7 @@ bool MockKeyboardDriverWin::SetLayout(int layout) {
     {L"00001009", MockKeyboard::LAYOUT_CANADIAN_FRENCH},
   };
 
-  for (size_t i = 0; i < base::size(kLanguageIDs); ++i) {
+  for (size_t i = 0; i < std::size(kLanguageIDs); ++i) {
     if (layout == kLanguageIDs[i].keyboard_layout) {
       HKL new_keyboard_layout = LoadKeyboardLayout(kLanguageIDs[i].language,
                                                    KLF_ACTIVATE);
@@ -143,7 +142,7 @@ bool MockKeyboardDriverWin::SetModifiers(int modifiers) {
     {VK_RCONTROL, MockKeyboard::RIGHT_CONTROL},
     {VK_RMENU,    MockKeyboard::RIGHT_ALT},
   };
-  for (size_t i = 0; i < base::size(kModifierMasks); ++i) {
+  for (size_t i = 0; i < std::size(kModifierMasks); ++i) {
     const int kKeyDownMask = 0x80;
     if (modifiers & kModifierMasks[i].mask)
       keyboard_states_[kModifierMasks[i].key_code] = kKeyDownMask;
@@ -161,7 +160,7 @@ int MockKeyboardDriverWin::GetCharacters(int key_code,
   wchar_t code[16];
   int length =
       ToUnicodeEx(key_code, MapVirtualKey(key_code, 0), &keyboard_states_[0],
-                  &code[0], base::size(code), 0, active_keyboard_layout_);
+                  &code[0], std::size(code), 0, active_keyboard_layout_);
   if (length > 0)
     output->assign(code);
   return length;

content/web_test/browser/web_test_browser_main_platform_support_win.cc

@@ -6,12 +6,12 @@
 
 #include <stddef.h>
 #include <windows.h>
+
 #include <iostream>
 #include <list>
 #include <string>
 
 #include "base/command_line.h"
-#include "base/cxx17_backports.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ -64,7 +64,7 @@ bool WebTestBrowserCheckLayoutSystemDeps() {
                               &metrics.lfSmCaptionFont};
   const wchar_t required_font[] = L"Segoe UI";
   int required_font_size = -12;
-  for (size_t i = 0; i < base::size(system_fonts); ++i) {
+  for (size_t i = 0; i < std::size(system_fonts); ++i) {
     if (system_fonts[i]->lfHeight != required_font_size ||
         wcscmp(required_font, system_fonts[i]->lfFaceName)) {
       errors.push_back(

content/web_test/browser/web_test_content_browser_client.cc

@@ -12,7 +12,6 @@
 #include <vector>
 
 #include "base/bind.h"
-#include "base/cxx17_backports.h"
 #include "base/no_destructor.h"
 #include "base/path_service.h"
 #include "base/strings/pattern.h"
@@ -351,8 +350,7 @@ void WebTestContentBrowserClient::AppendExtraCommandLineSwitches(
   };
 
   command_line->CopySwitchesFrom(*base::CommandLine::ForCurrentProcess(),
-                                 kForwardSwitches,
-                                 base::size(kForwardSwitches));
+                                 kForwardSwitches, std::size(kForwardSwitches));
 }
 
 std::unique_ptr<BrowserMainParts>
@@ -411,8 +409,8 @@ WebTestContentBrowserClient::GetOriginsRequiringDedicatedProcess() {
     };
 
     origins_to_isolate.reserve(origins_to_isolate.size() +
-                               base::size(kWptHostnames) *
-                                   base::size(kOriginTemplates));
+                               std::size(kWptHostnames) *
+                                   std::size(kOriginTemplates));
     for (const char* kWptHostname : kWptHostnames) {
       for (const char* kOriginTemplate : kOriginTemplates) {
         std::string origin = base::StringPrintf(kOriginTemplate, kWptHostname);

content/web_test/browser/web_test_push_messaging_service.cc

@@ -6,7 +6,6 @@
 
 #include "base/bind.h"
 #include "base/callback.h"
-#include "base/cxx17_backports.h"
 #include "base/time/time.h"
 #include "content/public/browser/permission_type.h"
 #include "content/web_test/browser/web_test_browser_context.h"
@@ -84,9 +83,9 @@ void WebTestPushMessagingService::SubscribeFromWorker(
 
   if (permission_status == blink::mojom::PermissionStatus::GRANTED) {
     std::vector<uint8_t> p256dh(kTestP256Key,
-                                kTestP256Key + base::size(kTestP256Key));
+                                kTestP256Key + std::size(kTestP256Key));
     std::vector<uint8_t> auth(kAuthentication,
-                              kAuthentication + base::size(kAuthentication));
+                              kAuthentication + std::size(kAuthentication));
     const std::string subscription_id = "layoutTestRegistrationId";
     const GURL endpoint = CreateEndpoint(subscription_id);
 
@@ -110,9 +109,9 @@ void WebTestPushMessagingService::GetSubscriptionInfo(
     const std::string& subscription_id,
     SubscriptionInfoCallback callback) {
   std::vector<uint8_t> p256dh(kTestP256Key,
-                              kTestP256Key + base::size(kTestP256Key));
+                              kTestP256Key + std::size(kTestP256Key));
   std::vector<uint8_t> auth(kAuthentication,
-                            kAuthentication + base::size(kAuthentication));
+                            kAuthentication + std::size(kAuthentication));
   const GURL endpoint = CreateEndpoint(subscription_id);
   std::move(callback).Run(true /* is_valid */, endpoint, GetFutureTime(),
                           p256dh, auth);

content/web_test/renderer/accessibility_controller.cc

@@ -4,7 +4,6 @@
 
 #include "content/web_test/renderer/accessibility_controller.h"
 
-#include "base/cxx17_backports.h"
 #include "content/web_test/renderer/web_frame_test_proxy.h"
 #include "gin/handle.h"
 #include "gin/object_template_builder.h"
@@ -235,7 +234,7 @@ void AccessibilityController::PostNotification(
   };
   local_frame->CallFunctionEvenIfScriptDisabled(
       v8::Local<v8::Function>::New(isolate, notification_callback_),
-      context->Global(), base::size(argv), argv);
+      context->Global(), std::size(argv), argv);
 }
 
 void AccessibilityController::LogAccessibilityEvents() {

content/web_test/renderer/web_ax_object_proxy.cc

@@ -10,7 +10,6 @@
 #include <map>
 #include <utility>
 
-#include "base/cxx17_backports.h"
 #include "base/strings/stringprintf.h"
 #include "gin/handle.h"
 #include "third_party/blink/public/platform/web_string.h"
@@ -505,7 +504,7 @@ void WebAXObjectProxy::NotificationReceived(
   // dirtying layout during post-layout hooks?
   frame->CallFunctionEvenIfScriptDisabled(
       v8::Local<v8::Function>::New(isolate, notification_callback_),
-      context->Global(), base::size(argv), argv);
+      context->Global(), std::size(argv), argv);
 }
 
 void WebAXObjectProxy::Reset() {

content/web_test/renderer/web_test_grammar_checker.cc

@@ -9,7 +9,6 @@
 #include <algorithm>
 
 #include "base/check.h"
-#include "base/cxx17_backports.h"
 #include "base/strings/string_util.h"
 #include "third_party/blink/public/platform/web_string.h"
 #include "third_party/blink/public/web/web_text_checking_result.h"
@@ -54,7 +53,7 @@ bool WebTestGrammarChecker::CheckGrammarOfString(
       {"the the adlj adaasj sdklj. there there", 33, 5},
       {"zz apple orange.", 0, 16},
   };
-  for (size_t i = 0; i < base::size(kGrammarErrors); ++i) {
+  for (size_t i = 0; i < std::size(kGrammarErrors); ++i) {
     size_t offset = 0;
     std::u16string error(
         kGrammarErrors[i].text,

content/web_test/renderer/web_test_spell_checker.cc

@@ -9,7 +9,6 @@
 #include <algorithm>
 
 #include "base/check_op.h"
-#include "base/cxx17_backports.h"
 #include "base/strings/string_util.h"
 
 namespace content {
@@ -165,7 +164,7 @@ bool WebTestSpellChecker::InitializeIfNeeded() {
       "ifmmp", "qwertyuiopasd", "qwertyuiopasdf", "upper case", "wellcome"};
 
   misspelled_words_.clear();
-  for (size_t i = 0; i < base::size(misspelled_words); ++i)
+  for (size_t i = 0; i < std::size(misspelled_words); ++i)
     misspelled_words_.push_back(
         std::u16string(misspelled_words[i],
                        misspelled_words[i] + strlen(misspelled_words[i])));