Move Singleton and related structs to namespace base

chrome/browser/supervised_user/child_accounts/child_account_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/child_accounts/child_account_service_factory.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/account_tracker_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/supervised_user/child_accounts/child_account_service.h"
 #include "chrome/browser/supervised_user/supervised_user_service_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
 ChildAccountService* ChildAccountServiceFactory::GetForProfile(
     Profile* profile) {
   return static_cast<ChildAccountService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 ChildAccountServiceFactory* ChildAccountServiceFactory::GetInstance() {
-  return Singleton<ChildAccountServiceFactory>::get();
+  return base::Singleton<ChildAccountServiceFactory>::get();
 }
 
 ChildAccountServiceFactory::ChildAccountServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "ChildAccountService",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(AccountTrackerServiceFactory::GetInstance());
   DependsOn(SigninManagerFactory::GetInstance());
   DependsOn(SupervisedUserServiceFactory::GetInstance());
 }
 
 ChildAccountServiceFactory::~ChildAccountServiceFactory() {}
 
 KeyedService* ChildAccountServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new ChildAccountService(static_cast<Profile*>(profile));
 }