Move Singleton and related structs to namespace base

chrome/browser/sync/sync_error_notifier_factory_ash.cc

 // Copyright 2014 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/sync/sync_error_notifier_factory_ash.h"
 
 #include "ash/shell.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/profile_sync_service.h"
@@ skipping 12 matching lines @@
 
 // static
 SyncErrorNotifier* SyncErrorNotifierFactory::GetForProfile(
     Profile* profile) {
   return static_cast<SyncErrorNotifier*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 SyncErrorNotifierFactory* SyncErrorNotifierFactory::GetInstance() {
-  return Singleton<SyncErrorNotifierFactory>::get();
+  return base::Singleton<SyncErrorNotifierFactory>::get();
 }
 
 KeyedService* SyncErrorNotifierFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   if (!ash::Shell::HasInstance())
     return NULL;
 
   Profile* profile = static_cast<Profile*>(context);
   ProfileSyncService* profile_sync_service =
       ProfileSyncServiceFactory::GetForProfile(profile);
 
   if (!profile_sync_service)
     return NULL;
 
   SyncErrorController* sync_error_controller =
       profile_sync_service->sync_error_controller();
   if (!sync_error_controller)
     return NULL;
 
   return new SyncErrorNotifier(sync_error_controller, profile);
 }