Move Singleton and related structs to namespace base

chrome/browser/sessions/session_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 "chrome/browser/sessions/session_service_factory.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_data_deleter.h"
 #include "chrome/browser/sessions/session_service.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 45 matching lines @@
   factory->GetServiceForBrowserContext(profile, true);
 
   // Shut down and remove the reference to the session service, and replace it
   // with an explicit NULL to prevent it being recreated on the next access.
   factory->BrowserContextShutdown(profile);
   factory->BrowserContextDestroyed(profile);
   factory->Associate(profile, NULL);
 }
 
 SessionServiceFactory* SessionServiceFactory::GetInstance() {
-  return Singleton<SessionServiceFactory>::get();
+  return base::Singleton<SessionServiceFactory>::get();
 }
 
 SessionServiceFactory::SessionServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "SessionService",
         BrowserContextDependencyManager::GetInstance()) {
 }
 
 SessionServiceFactory::~SessionServiceFactory() {
 }
 
 KeyedService* SessionServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   SessionService* service = NULL;
   service = new SessionService(static_cast<Profile*>(profile));
   service->ResetFromCurrentBrowsers();
   return service;
 }
 
 bool SessionServiceFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }
 
 bool SessionServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }