Move Singleton and related structs to namespace base

chrome/browser/ui/app_list/start_page_service_factory.cc

 // Copyright 2014 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/start_page_service_factory.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/extensions/install_tracker_factory.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 13 matching lines @@
       !app_list::switches::IsVoiceSearchEnabled()) {
     return NULL;
   }
 
   return static_cast<StartPageService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 StartPageServiceFactory* StartPageServiceFactory::GetInstance() {
-  return Singleton<StartPageServiceFactory>::get();
+  return base::Singleton<StartPageServiceFactory>::get();
 }
 
 StartPageServiceFactory::StartPageServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "AppListStartPageService",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(
       extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
   DependsOn(extensions::InstallTrackerFactory::GetInstance());
   DependsOn(TemplateURLServiceFactory::GetInstance());
 }
 
 StartPageServiceFactory::~StartPageServiceFactory() {}
 
 KeyedService* StartPageServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = static_cast<Profile*>(context);
   return new StartPageService(profile);
 }
 
 content::BrowserContext* StartPageServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   // The start page service needs an instance in ChromeOS guest mode.
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }
 
 }  // namespace app_list