Move Singleton and related structs to namespace base

chrome/browser/apps/ephemeral_app_service_factory.cc

 // Copyright 2013 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/apps/ephemeral_app_service_factory.h"
 
 #include "apps/app_lifetime_monitor_factory.h"
 #include "chrome/browser/apps/ephemeral_app_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
 
 using extensions::ExtensionsBrowserClient;
 
 // static
 EphemeralAppService*
 EphemeralAppServiceFactory::GetForProfile(Profile* profile) {
   return static_cast<EphemeralAppService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 EphemeralAppServiceFactory* EphemeralAppServiceFactory::GetInstance() {
-  return Singleton<EphemeralAppServiceFactory>::get();
+  return base::Singleton<EphemeralAppServiceFactory>::get();
 }
 
 EphemeralAppServiceFactory::EphemeralAppServiceFactory()
     : BrowserContextKeyedServiceFactory(
           "EphemeralAppService",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
   DependsOn(apps::AppLifetimeMonitorFactory::GetInstance());
 }
 
@@ skipping 10 matching lines @@
   return ExtensionsBrowserClient::Get()->GetOriginalContext(context);
 }
 
 bool EphemeralAppServiceFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }
 
 bool EphemeralAppServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }