Move Singleton and related structs to namespace base

chrome/browser/ui/webui/ntp/app_resource_cache_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/ui/webui/ntp/app_resource_cache_factory.h"
 
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/webui/ntp/ntp_resource_cache.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
 NTPResourceCache* AppResourceCacheFactory::GetForProfile(Profile* profile) {
   return static_cast<NTPResourceCache*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 AppResourceCacheFactory* AppResourceCacheFactory::GetInstance() {
-  return Singleton<AppResourceCacheFactory>::get();
+  return base::Singleton<AppResourceCacheFactory>::get();
 }
 
 AppResourceCacheFactory::AppResourceCacheFactory()
     : BrowserContextKeyedServiceFactory(
         "AppResourceCache",
         BrowserContextDependencyManager::GetInstance()) {
 #if defined(ENABLE_THEMES)
   DependsOn(ThemeServiceFactory::GetInstance());
 #endif
 }
 
 AppResourceCacheFactory::~AppResourceCacheFactory() {}
 
 KeyedService* AppResourceCacheFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new NTPResourceCache(static_cast<Profile*>(profile));
 }
 
 content::BrowserContext* AppResourceCacheFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }