Move Singleton and related structs to namespace base

chrome/browser/supervised_user/supervised_user_settings_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/supervised_user/supervised_user_settings_service_factory.h"
 
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/supervised_user/supervised_user_settings_service.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
 SupervisedUserSettingsService*
 SupervisedUserSettingsServiceFactory::GetForProfile(Profile* profile) {
   return static_cast<SupervisedUserSettingsService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 SupervisedUserSettingsServiceFactory*
 SupervisedUserSettingsServiceFactory::GetInstance() {
-  return Singleton<SupervisedUserSettingsServiceFactory>::get();
+  return base::Singleton<SupervisedUserSettingsServiceFactory>::get();
 }
 
 SupervisedUserSettingsServiceFactory::SupervisedUserSettingsServiceFactory()
     : BrowserContextKeyedServiceFactory(
           "SupervisedUserSettingsService",
           BrowserContextDependencyManager::GetInstance()) {
 }
 
 SupervisedUserSettingsServiceFactory::
     ~SupervisedUserSettingsServiceFactory() {}
 
 KeyedService* SupervisedUserSettingsServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new SupervisedUserSettingsService(
       Profile::FromBrowserContext(profile));
 }
 
 content::BrowserContext*
 SupervisedUserSettingsServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }