Create top level apps component and move some apps code there.

apps/app_restore_service_factory.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_APP_RESTORE_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_EXTENSIONS_APP_RESTORE_SERVICE_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 class Profile;
 
-namespace extensions {
+namespace apps {
 
 class AppRestoreService;
 
 // Singleton that owns all AppRestoreServices and associates them with
 // Profiles. Listens for the Profile's destruction notification and cleans up
 // the associated AppRestoreService.
 class AppRestoreServiceFactory : public ProfileKeyedServiceFactory {
  public:
   static AppRestoreService* GetForProfile(Profile* profile);
 
   static void ResetForProfile(Profile* profile);
 
   static AppRestoreServiceFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<AppRestoreServiceFactory>;
 
   AppRestoreServiceFactory();
   virtual ~AppRestoreServiceFactory();
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
   virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
 };
 
-}  // namespace extensions
+}  // namespace apps
 
 #endif  // CHROME_BROWSER_EXTENSIONS_APP_RESTORE_SERVICE_FACTORY_H_