Move Singleton and related structs to namespace base

components/power/origin_power_map_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 "components/power/origin_power_map_factory.h"
 
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/power/origin_power_map.h"
 
 namespace power {
 // static
 OriginPowerMap* OriginPowerMapFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<OriginPowerMap*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 OriginPowerMapFactory* OriginPowerMapFactory::GetInstance() {
-  return Singleton<OriginPowerMapFactory>::get();
+  return base::Singleton<OriginPowerMapFactory>::get();
 }
 
 OriginPowerMapFactory::OriginPowerMapFactory()
     : BrowserContextKeyedServiceFactory(
           "OriginPowerMap",
           BrowserContextDependencyManager::GetInstance()) {
 }
 
 OriginPowerMapFactory::~OriginPowerMapFactory() {
 }
 
 KeyedService* OriginPowerMapFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new OriginPowerMap();
 }
 
 }  // namespace power