Move Singleton and related structs to namespace base

apps/app_load_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 "apps/app_load_service_factory.h"
 
 #include "apps/app_load_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/browser/app_window/app_window_registry.h"
 #include "extensions/browser/extension_prefs_factory.h"
 #include "extensions/browser/extension_registry_factory.h"
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
 
 namespace apps {
 
 // static
 AppLoadService* AppLoadServiceFactory::GetForProfile(Profile* profile) {
   return static_cast<AppLoadService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 AppLoadServiceFactory* AppLoadServiceFactory::GetInstance() {
-  return Singleton<AppLoadServiceFactory>::get();
+  return base::Singleton<AppLoadServiceFactory>::get();
 }
 
 AppLoadServiceFactory::AppLoadServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "AppLoadService",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(extensions::AppWindowRegistry::Factory::GetInstance());
   DependsOn(extensions::ExtensionPrefsFactory::GetInstance());
   DependsOn(extensions::ExtensionRegistryFactory::GetInstance());
   DependsOn(
@@ skipping 17 matching lines @@
 }
 
 content::BrowserContext* AppLoadServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   // Redirected in incognito.
   return extensions::ExtensionsBrowserClient::Get()->
       GetOriginalContext(context);
 }
 
 }  // namespace apps