Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/gpu/gpu_mode_manager.cc

 // Copyright (c) 2013 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/gpu/gpu_mode_manager.h"
 
 #include "base/bind.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/browser/user_metrics.h"
 
 using base::UserMetricsAction;
 
 namespace {
 
 bool GetPreviousGpuModePref() {
   PrefService* service = g_browser_process->local_state();
   DCHECK(service);
   return service->GetBoolean(prefs::kHardwareAccelerationModePrevious);
 }
 
 void SetPreviousGpuModePref(bool enabled) {
   PrefService* service = g_browser_process->local_state();
   DCHECK(service);
   service->SetBoolean(prefs::kHardwareAccelerationModePrevious, enabled);
 }
 
-}  // namespace anonymous
+}  // namespace
 
 // static
 void GpuModeManager::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(
       prefs::kHardwareAccelerationModeEnabled, true);
   registry->RegisterBooleanPref(
       prefs::kHardwareAccelerationModePrevious, true);
 }
 
 GpuModeManager::GpuModeManager()
@@ skipping 34 matching lines @@
 }
 
 // static
 bool GpuModeManager::IsGpuModePrefEnabled() {
   PrefService* service = g_browser_process->local_state();
   DCHECK(service);
   return service->GetBoolean(
       prefs::kHardwareAccelerationModeEnabled);
 }