Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

media/mojo/services/mojo_media_application.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.
 
 #include "base/memory/ref_counted.h"
 #include "media/mojo/interfaces/service_factory.mojom.h"
 #include "mojo/shell/public/cpp/application_delegate.h"
 #include "mojo/shell/public/cpp/interface_factory_impl.h"
 #include "url/gurl.h"
 
 namespace media {
 
 class MediaLog;
 class MojoMediaClient;
 
 class MojoMediaApplication
     : public mojo::ApplicationDelegate,
       public mojo::InterfaceFactory<interfaces::ServiceFactory> {
  public:
   static scoped_ptr<mojo::ApplicationDelegate> CreateApp();
 
   explicit MojoMediaApplication(scoped_ptr<MojoMediaClient> mojo_media_client);
   ~MojoMediaApplication() final;
 
  private:
   // mojo::ApplicationDelegate implementation.
-  void Initialize(mojo::ApplicationImpl* app) final;
+  void Initialize(mojo::Shell* shell,
+                  const std::string& url,
+                  uint32_t id) final;
   bool AcceptConnection(mojo::ApplicationConnection* connection) final;
 
   // mojo::InterfaceFactory<interfaces::ServiceFactory> implementation.
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<interfaces::ServiceFactory> request) final;
 
   scoped_ptr<MojoMediaClient> mojo_media_client_;
-  mojo::ApplicationImpl* app_impl_;
+  mojo::Shell* shell_;
   scoped_refptr<MediaLog> media_log_;
 };
 
 }  // namespace media