components: default the user-defined empty ctor and dtor where possible

I need an owner's approval please for changes under:
['components/favicon', 'components/favicon_base', 'components/query_parser', 'components/sessions', 'components/visitedlink']

This is a mechanical change. There are a few instances (but not all)
of empty user-defined constructors and destructors which can be
defaulted in the /components code.

This CL was uploaded by git cl split.

R=sky@chromium.org

Bug: 371316188
Change-Id: If2b363c364d8437b6a65434bacc49a73a033152f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5918669
Auto-Submit: Sorin Jianu <sorin@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1366386}

components/sessions/content/content_live_tab.cc

@@ -31,7 +31,7 @@ ContentLiveTab* ContentLiveTab::GetForWebContents(
 ContentLiveTab::ContentLiveTab(content::WebContents* contents)
     : web_contents_(contents) {}
 
-ContentLiveTab::~ContentLiveTab() {}
+ContentLiveTab::~ContentLiveTab() = default;
 
 bool ContentLiveTab::IsInitialBlankNavigation() {
   return navigation_controller().IsInitialBlankNavigation();

components/sessions/content/content_serialized_navigation_builder_unittest.cc

@@ -48,7 +48,7 @@ class TestExtendedInfoHandler : public ExtendedInfoHandler {
   TestExtendedInfoHandler(const TestExtendedInfoHandler&) = delete;
   TestExtendedInfoHandler& operator=(const TestExtendedInfoHandler&) = delete;
 
-  ~TestExtendedInfoHandler() override {}
+  ~TestExtendedInfoHandler() override = default;
 
   // ExtendedInfoHandler:
   std::string GetExtendedInfo(content::NavigationEntry* entry) const override {
@@ -111,14 +111,14 @@ void SetExtendedInfoForTest(content::NavigationEntry* entry) {
 
 class ContentSerializedNavigationBuilderTest : public testing::Test {
  public:
-  ContentSerializedNavigationBuilderTest() {}
+  ContentSerializedNavigationBuilderTest() = default;
 
   ContentSerializedNavigationBuilderTest(
       const ContentSerializedNavigationBuilderTest&) = delete;
   ContentSerializedNavigationBuilderTest& operator=(
       const ContentSerializedNavigationBuilderTest&) = delete;
 
-  ~ContentSerializedNavigationBuilderTest() override {}
+  ~ContentSerializedNavigationBuilderTest() override = default;
 
   void SetUp() override {
     ContentSerializedNavigationDriver* driver =

components/sessions/content/extended_info_handler.h

@@ -22,8 +22,8 @@ namespace sessions {
 // Chrome.
 class SESSIONS_EXPORT ExtendedInfoHandler {
  public:
-  ExtendedInfoHandler() {}
-  virtual ~ExtendedInfoHandler() {}
+  ExtendedInfoHandler() = default;
+  virtual ~ExtendedInfoHandler() = default;
 
   // Returns the data to write to disk for the specified NavigationEntry.
   virtual std::string GetExtendedInfo(

components/sessions/content/navigation_task_id.cc

@@ -11,12 +11,12 @@
 namespace sessions {
 const char kTaskIdKey[] = "task_id_data";
 
-NavigationTaskId::NavigationTaskId() {}
+NavigationTaskId::NavigationTaskId() = default;
 
 NavigationTaskId::NavigationTaskId(const NavigationTaskId& navigation_task_id) =
     default;
 
-NavigationTaskId::~NavigationTaskId() {}
+NavigationTaskId::~NavigationTaskId() = default;
 
 NavigationTaskId* NavigationTaskId::Get(content::NavigationEntry* entry) {
   NavigationTaskId* navigation_task_id =

components/sessions/content/navigation_task_id_unittest.cc

@@ -12,12 +12,12 @@ namespace sessions {
 
 class NavigationTaskIDTest : public testing::Test {
  public:
-  NavigationTaskIDTest() {}
+  NavigationTaskIDTest() = default;
 
   NavigationTaskIDTest(const NavigationTaskIDTest&) = delete;
   NavigationTaskIDTest& operator=(const NavigationTaskIDTest&) = delete;
 
-  ~NavigationTaskIDTest() override {}
+  ~NavigationTaskIDTest() override = default;
 
   void SetUp() override {
     navigation_entry_ = content::NavigationEntry::Create();

components/sessions/core/command_storage_manager_delegate.h

@@ -15,7 +15,7 @@ namespace sessions {
 // chrome/content dependencies.
 class CommandStorageManagerDelegate {
  public:
-  CommandStorageManagerDelegate() {}
+  CommandStorageManagerDelegate() = default;
 
   // Returns true if save operations can be performed as a delayed task - which
   // is usually only used by unit tests.
@@ -34,7 +34,7 @@ class CommandStorageManagerDelegate {
   virtual void OnErrorWritingSessionCommands() = 0;
 
  protected:
-  virtual ~CommandStorageManagerDelegate() {}
+  virtual ~CommandStorageManagerDelegate() = default;
 };
 
 }  // namespace sessions

components/sessions/core/live_tab.cc

@@ -6,7 +6,7 @@
 
 namespace sessions {
 
-LiveTab::~LiveTab() {}
+LiveTab::~LiveTab() = default;
 
 std::unique_ptr<tab_restore::PlatformSpecificTabData>
 LiveTab::GetPlatformSpecificTabData() {

components/sessions/core/live_tab_context.h

@@ -87,7 +87,7 @@ class SESSIONS_EXPORT LiveTabContext {
   virtual void CloseTab() = 0;
 
  protected:
-  virtual ~LiveTabContext() {}
+  virtual ~LiveTabContext() = default;
 };
 
 }  // namespace sessions

components/sessions/core/serialized_navigation_driver.h

@@ -38,7 +38,7 @@ class SESSIONS_EXPORT SerializedNavigationDriver {
       const std::string& page_state) const = 0;
 
  protected:
-  virtual ~SerializedNavigationDriver() {}
+  virtual ~SerializedNavigationDriver() = default;
 };
 
 }  // namespace sessions

components/sessions/core/session_id_generator.cc

@@ -96,7 +96,7 @@ SessionIdGenerator::SessionIdGenerator()
       last_value_(0),
       rand_generator_(base::BindRepeating(&DefaultRandGenerator)) {}
 
-SessionIdGenerator::~SessionIdGenerator() {}
+SessionIdGenerator::~SessionIdGenerator() = default;
 
 void SessionIdGenerator::IncrementValueBy(int increment) {
   DCHECK_LT(0, increment);

components/sessions/core/session_types.cc

@@ -28,7 +28,7 @@ SessionTab::~SessionTab() {
 
 SessionTabGroup::SessionTabGroup(const tab_groups::TabGroupId& id) : id(id) {}
 
-SessionTabGroup::~SessionTabGroup() {}
+SessionTabGroup::~SessionTabGroup() = default;
 
 // SessionWindow ---------------------------------------------------------------
 
@@ -40,6 +40,6 @@ SessionWindow::SessionWindow()
       is_constrained(true),
       show_state(ui::mojom::WindowShowState::kDefault) {}
 
-SessionWindow::~SessionWindow() {}
+SessionWindow::~SessionWindow() = default;
 
 }  // namespace sessions

components/sessions/core/tab_restore_service_client.cc

@@ -6,7 +6,7 @@
 
 namespace sessions {
 
-TabRestoreServiceClient::~TabRestoreServiceClient() {}
+TabRestoreServiceClient::~TabRestoreServiceClient() = default;
 
 void TabRestoreServiceClient::OnTabRestored(const GURL& url) {}
 

components/sessions/core/tab_restore_service_observer.h

@@ -26,7 +26,7 @@ class SESSIONS_EXPORT TabRestoreServiceObserver {
   virtual void TabRestoreServiceLoaded(TabRestoreService* service) {}
 
  protected:
-  virtual ~TabRestoreServiceObserver() {}
+  virtual ~TabRestoreServiceObserver() = default;
 };
 
 }  // namespace sessions

components/sessions/ios/ios_live_tab.mm

@@ -7,6 +7,6 @@
 
 namespace sessions {
 
-IOSLiveTab::~IOSLiveTab() {}
+IOSLiveTab::~IOSLiveTab() = default;
 
 }  // namespace sessions

components/sessions/ios/ios_restore_live_tab.mm

@@ -11,7 +11,7 @@ namespace sessions {
 RestoreIOSLiveTab::RestoreIOSLiveTab(web::proto::NavigationStorage storage)
     : storage_(std::move(storage)) {}
 
-RestoreIOSLiveTab::~RestoreIOSLiveTab() {}
+RestoreIOSLiveTab::~RestoreIOSLiveTab() = default;
 
 bool RestoreIOSLiveTab::IsInitialBlankNavigation() {
   return false;

components/sessions/ios/ios_webstate_live_tab.mm

@@ -28,7 +28,7 @@ IOSWebStateLiveTab* IOSWebStateLiveTab::GetForWebState(
 IOSWebStateLiveTab::IOSWebStateLiveTab(web::WebState* web_state)
     : web_state_(web_state) {}
 
-IOSWebStateLiveTab::~IOSWebStateLiveTab() {}
+IOSWebStateLiveTab::~IOSWebStateLiveTab() = default;
 
 bool IOSWebStateLiveTab::IsInitialBlankNavigation() {
   return navigation_manager()->GetItemCount() == 0;