Make UMA_HISTOGRAM_ENUMERATION work with scoped enums.

chrome/browser/extensions/installed_loader.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/installed_loader.h"
 
 #include <stddef.h>
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 114 matching lines @@
     return BACKGROUND_PAGE_PERSISTENT;
   return EVENT_PAGE;
 }
 
 // Records the creation flags of an extension grouped by
 // Extension::InitFromValueFlags.
 void RecordCreationFlags(const Extension* extension) {
   for (int i = 0; i < Extension::kInitFromValueFlagBits; ++i) {
     int flag = 1 << i;
     if (extension->creation_flags() & flag) {
-      UMA_HISTOGRAM_ENUMERATION(
-          "Extensions.LoadCreationFlags", i, Extension::kInitFromValueFlagBits);
+      UMA_HISTOGRAM_EXACT_LINEAR("Extensions.LoadCreationFlags", i,
+                                 Extension::kInitFromValueFlagBits);
     }
   }
 }
 
 // Helper to record a single disable reason histogram value (see
 // RecordDisableReasons below).
 void RecordDisbleReasonHistogram(int reason) {
   UMA_HISTOGRAM_SPARSE_SLOWLY("Extensions.DisableReason", reason);
 }
 
@@ skipping 477 matching lines @@
 int InstalledLoader::GetCreationFlags(const ExtensionInfo* info) {
   int flags = extension_prefs_->GetCreationFlags(info->extension_id);
   if (!Manifest::IsUnpackedLocation(info->extension_location))
     flags |= Extension::REQUIRE_KEY;
   if (extension_prefs_->AllowFileAccess(info->extension_id))
     flags |= Extension::ALLOW_FILE_ACCESS;
   return flags;
 }
 
 }  // namespace extensions