Move Singleton and related structs to namespace base

chrome/browser/ui/app_list/search/common/webservice_cache_factory.cc

 // Copyright 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/app_list/search/common/webservice_cache_factory.h"
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/ui/app_list/search/common/webservice_cache.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 namespace app_list {
 
 // static
 WebserviceCacheFactory* WebserviceCacheFactory::GetInstance() {
-  return Singleton<WebserviceCacheFactory>::get();
+  return base::Singleton<WebserviceCacheFactory>::get();
 }
 
 // static
 WebserviceCache* WebserviceCacheFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<WebserviceCache*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 WebserviceCacheFactory::WebserviceCacheFactory()
     : BrowserContextKeyedServiceFactory(
           "app_list::WebserviceCache",
           BrowserContextDependencyManager::GetInstance()) {}
 
 WebserviceCacheFactory::~WebserviceCacheFactory() {}
 
 KeyedService* WebserviceCacheFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new WebserviceCache(context);
 }
 
 }  // namespace app_list