[gin] Remove some long expired histograms

- Purge code since they haven't been active in a few years.

Bug: 1508059
Change-Id: I85b0529aeceb2faafdaa6f51d723b4485a2a70cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5105691
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1241943}

gin/v8_initializer.cc

@@ -152,52 +152,31 @@ base::File OpenV8File(const char* file_name,
   // Re-try logic here is motivated by http://crbug.com/479537
   // for A/V on Windows (https://support.microsoft.com/en-us/kb/316609).
 
-  // These match tools/metrics/histograms.xml
-  enum OpenV8FileResult {
-    OPENED = 0,
-    OPENED_RETRY,
-    FAILED_IN_USE,
-    FAILED_OTHER,
-    MAX_VALUE
-  };
   base::FilePath path;
   GetV8FilePath(file_name, &path);
 
 #if BUILDFLAG(IS_ANDROID)
   base::File file(base::android::OpenApkAsset(path.value(), region_out));
-  OpenV8FileResult result = file.IsValid() ? OpenV8FileResult::OPENED
-                                           : OpenV8FileResult::FAILED_OTHER;
 #else
   // Re-try logic here is motivated by http://crbug.com/479537
   // for A/V on Windows (https://support.microsoft.com/en-us/kb/316609).
   const int kMaxOpenAttempts = 5;
   const int kOpenRetryDelayMillis = 250;
 
-  OpenV8FileResult result = OpenV8FileResult::FAILED_IN_USE;
   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
   base::File file;
   for (int attempt = 0; attempt < kMaxOpenAttempts; attempt++) {
     file.Initialize(path, flags);
     if (file.IsValid()) {
       *region_out = base::MemoryMappedFile::Region::kWholeFile;
-      if (attempt == 0) {
-        result = OpenV8FileResult::OPENED;
-        break;
-      } else {
-        result = OpenV8FileResult::OPENED_RETRY;
-        break;
-      }
+      break;
     } else if (file.error_details() != base::File::FILE_ERROR_IN_USE) {
-      result = OpenV8FileResult::FAILED_OTHER;
       break;
     } else if (kMaxOpenAttempts - 1 != attempt) {
       base::PlatformThread::Sleep(base::Milliseconds(kOpenRetryDelayMillis));
     }
   }
 #endif  // BUILDFLAG(IS_ANDROID)
-
-  UMA_HISTOGRAM_ENUMERATION("V8.Initializer.OpenV8File.Result", result,
-                            OpenV8FileResult::MAX_VALUE);
   return file;
 }
 

tools/metrics/histograms/metadata/v8/histograms.xml

@@ -1138,18 +1138,6 @@ chromium-metrics-reviews@google.com.
   </summary>
 </histogram>
 
-<histogram name="V8.Initializer.LoadV8Snapshot.Result"
-    enum="V8InitializerLoadV8SnapshotResult" expires_after="M77">
-  <owner>oth@chromium.org</owner>
-  <summary>Results from snapshot loading.</summary>
-</histogram>
-
-<histogram name="V8.Initializer.OpenV8File.Result"
-    enum="V8InitializerOpenV8FileResult" expires_after="2020-05-10">
-  <owner>oth@chromium.org</owner>
-  <summary>Results from opening V8 snapshot files.</summary>
-</histogram>
-
 <histogram name="V8.LiftoffBailoutReasons" enum="LiftoffBailoutReason"
     expires_after="2024-05-12">
   <owner>ecmziegler@chromium.org</owner>