Move Singleton and related structs to namespace base

apps/app_restore_service_factory.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 "apps/app_restore_service_factory.h"
 
 #include "apps/app_lifetime_monitor_factory.h"
 #include "apps/app_restore_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 namespace apps {
 
 // static
 AppRestoreService* AppRestoreServiceFactory::GetForProfile(Profile* profile) {
   return static_cast<AppRestoreService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 AppRestoreServiceFactory* AppRestoreServiceFactory::GetInstance() {
-  return Singleton<AppRestoreServiceFactory>::get();
+  return base::Singleton<AppRestoreServiceFactory>::get();
 }
 
 AppRestoreServiceFactory::AppRestoreServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "AppRestoreService",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(AppLifetimeMonitorFactory::GetInstance());
 }
 
 AppRestoreServiceFactory::~AppRestoreServiceFactory() {
 }
 
 KeyedService* AppRestoreServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new AppRestoreService(static_cast<Profile*>(profile));
 }
 
 bool AppRestoreServiceFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }
 
 }  // namespace apps