Move Singleton and related structs to namespace base

chrome/browser/favicon/large_icon_service_factory.cc

 // Copyright 2015 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/favicon/large_icon_service_factory.h"
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/favicon/core/favicon_service.h"
 #include "components/favicon/core/large_icon_service.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "content/public/browser/browser_context.h"
 
 // static
 favicon::LargeIconService* LargeIconServiceFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<favicon::LargeIconService*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 LargeIconServiceFactory* LargeIconServiceFactory::GetInstance() {
-  return Singleton<LargeIconServiceFactory>::get();
+  return base::Singleton<LargeIconServiceFactory>::get();
 }
 
 LargeIconServiceFactory::LargeIconServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "LargeIconService",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(FaviconServiceFactory::GetInstance());
 }
 
 LargeIconServiceFactory::~LargeIconServiceFactory() {}
 
 KeyedService* LargeIconServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   favicon::FaviconService* favicon_service =
       FaviconServiceFactory::GetForProfile(Profile::FromBrowserContext(context),
                                            ServiceAccessType::EXPLICIT_ACCESS);
   return new favicon::LargeIconService(favicon_service);
 }
 
 bool LargeIconServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }