Move Singleton and related structs to namespace base

chrome/browser/printing/cloud_print/cloud_print_proxy_service_factory.cc

 // Copyright (c) 2012 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/printing/cloud_print/cloud_print_proxy_service_factory.h"
 
 #include "chrome/browser/printing/cloud_print/cloud_print_proxy_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
 CloudPrintProxyService* CloudPrintProxyServiceFactory::GetForProfile(
     Profile* profile) {
   return static_cast<CloudPrintProxyService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 CloudPrintProxyServiceFactory* CloudPrintProxyServiceFactory::GetInstance() {
-  return Singleton<CloudPrintProxyServiceFactory>::get();
+  return base::Singleton<CloudPrintProxyServiceFactory>::get();
 }
 
 CloudPrintProxyServiceFactory::CloudPrintProxyServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "CloudPrintProxyService",
         BrowserContextDependencyManager::GetInstance()) {
 }
 
 CloudPrintProxyServiceFactory::~CloudPrintProxyServiceFactory() {
 }
 
 KeyedService* CloudPrintProxyServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   CloudPrintProxyService* service =
       new CloudPrintProxyService(static_cast<Profile*>(profile));
   service->Initialize();
 
   return service;
 }
 
 bool CloudPrintProxyServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }