Move Singleton and related structs to namespace base

components/power/origin_power_map_factory.h

 // 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.
 
 #ifndef COMPONENTS_POWER_ORIGIN_POWER_MAP_FACTORY_H_
 #define COMPONENTS_POWER_ORIGIN_POWER_MAP_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 namespace power {
 
 class OriginPowerMap;
 
 class OriginPowerMapFactory : public BrowserContextKeyedServiceFactory {
  public:
   static OriginPowerMap* GetForBrowserContext(content::BrowserContext* context);
   static OriginPowerMapFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<OriginPowerMapFactory>;
+  friend struct base::DefaultSingletonTraits<OriginPowerMapFactory>;
 
   OriginPowerMapFactory();
   ~OriginPowerMapFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(OriginPowerMapFactory);
 };
 
 }  // namespace power
 
 #endif  // COMPONENTS_POWER_ORIGIN_POWER_MAP_FACTORY_H_