Move Singleton and related structs to namespace base

chrome/browser/extensions/api/dial/dial_api_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 "chrome/browser/extensions/api/dial/dial_api_factory.h"
 
 #include "chrome/browser/extensions/api/dial/dial_api.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
 
 namespace extensions {
 
 // static
 scoped_refptr<DialAPI> DialAPIFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<DialAPI*>(
       GetInstance()->GetServiceForBrowserContext(context, true).get());
 }
 
 // static
 DialAPIFactory* DialAPIFactory::GetInstance() {
-  return Singleton<DialAPIFactory>::get();
+  return base::Singleton<DialAPIFactory>::get();
 }
 
 DialAPIFactory::DialAPIFactory() : RefcountedBrowserContextKeyedServiceFactory(
     "DialAPI", BrowserContextDependencyManager::GetInstance()) {
   DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
 }
 
 DialAPIFactory::~DialAPIFactory() {
 }
 
 scoped_refptr<RefcountedKeyedService> DialAPIFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return scoped_refptr<DialAPI>(new DialAPI(static_cast<Profile*>(profile)));
 }
 
 bool DialAPIFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }
 
 bool DialAPIFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
 
 }  // namespace extensions