Move Singleton and related structs to namespace base

chrome/browser/chromeos/file_system_provider/service_factory.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/chromeos/file_system_provider/service_factory.h"
 
 #include "chrome/browser/chromeos/file_system_provider/service.h"
 #include "chrome/browser/extensions/extension_system_factory.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_registry_factory.h"
 
 namespace chromeos {
 namespace file_system_provider {
 
 // static
 Service* ServiceFactory::Get(content::BrowserContext* context) {
   return static_cast<Service*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 Service* ServiceFactory::FindExisting(content::BrowserContext* context) {
   return static_cast<Service*>(
       GetInstance()->GetServiceForBrowserContext(context, false));
 }
 
 ServiceFactory* ServiceFactory::GetInstance() {
-  return Singleton<ServiceFactory>::get();
+  return base::Singleton<ServiceFactory>::get();
 }
 
 ServiceFactory::ServiceFactory()
     : BrowserContextKeyedServiceFactory(
           "Service",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(extensions::ExtensionRegistryFactory::GetInstance());
   DependsOn(extensions::ExtensionSystemFactory::GetInstance());
 }
 
 ServiceFactory::~ServiceFactory() {}
 
 KeyedService* ServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new Service(Profile::FromBrowserContext(profile),
                      extensions::ExtensionRegistry::Get(profile));
 }
 
 bool ServiceFactory::ServiceIsCreatedWithBrowserContext() const { return true; }
 
 content::BrowserContext* ServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos