Move Singleton and related structs to namespace base

chrome/browser/drive/drive_notification_manager_factory.cc

 // Copyright 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/drive/drive_notification_manager_factory.h"
 
 #include "base/logging.h"
 #include "chrome/browser/invalidation/profile_invalidation_provider_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/profile_sync_service.h"
@@ skipping 25 matching lines @@
     return NULL;
   }
 
   return static_cast<DriveNotificationManager*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 DriveNotificationManagerFactory*
 DriveNotificationManagerFactory::GetInstance() {
-  return Singleton<DriveNotificationManagerFactory>::get();
+  return base::Singleton<DriveNotificationManagerFactory>::get();
 }
 
 DriveNotificationManagerFactory::DriveNotificationManagerFactory()
     : BrowserContextKeyedServiceFactory(
         "DriveNotificationManager",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(ProfileSyncServiceFactory::GetInstance());
   DependsOn(invalidation::ProfileInvalidationProviderFactory::GetInstance());
 }
 
 DriveNotificationManagerFactory::~DriveNotificationManagerFactory() {}
 
 KeyedService* DriveNotificationManagerFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   invalidation::ProfileInvalidationProvider* invalidation_provider =
       invalidation::ProfileInvalidationProviderFactory::GetForProfile(
           Profile::FromBrowserContext(context));
   DCHECK(invalidation_provider);
   DCHECK(invalidation_provider->GetInvalidationService());
   return new DriveNotificationManager(
       invalidation_provider->GetInvalidationService());
 }
 
 }  // namespace drive