Move Singleton and related structs to namespace base

chrome/browser/extensions/token_cache/token_cache_service_factory.cc

 // Copyright (c) 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/extensions/token_cache/token_cache_service_factory.h"
 
 #include "chrome/browser/extensions/token_cache/token_cache_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
 extensions::TokenCacheService*
 TokenCacheServiceFactory::GetForProfile(Profile* profile) {
   return static_cast<extensions::TokenCacheService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
  }
 
 // static
 TokenCacheServiceFactory* TokenCacheServiceFactory::GetInstance() {
-  return Singleton<TokenCacheServiceFactory>::get();
+  return base::Singleton<TokenCacheServiceFactory>::get();
 }
 
 TokenCacheServiceFactory::TokenCacheServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "TokenCacheService",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(SigninManagerFactory::GetInstance());
 }
 
 TokenCacheServiceFactory::~TokenCacheServiceFactory() {
 }
 
 KeyedService* TokenCacheServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new extensions::TokenCacheService(static_cast<Profile*>(profile));
 }