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

media/mojo/services/mojo_media_application.h

Index: media/mojo/services/mojo_media_application.h
diff --git a/media/mojo/services/mojo_media_application.h b/media/mojo/services/mojo_media_application.h
index 03ef1c9017fcaab30f54487bd054b0adc834db15..c3ee1b7a04e17ae3de50294f66da22d39391468a 100644
--- a/media/mojo/services/mojo_media_application.h
+++ b/media/mojo/services/mojo_media_application.h
@@ -24,7 +24,9 @@ class MojoMediaApplication
 
  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.
@@ -32,7 +34,7 @@ class MojoMediaApplication
               mojo::InterfaceRequest<interfaces::ServiceFactory> request) final;
 
   scoped_ptr<MojoMediaClient> mojo_media_client_;
-  mojo::ApplicationImpl* app_impl_;
+  mojo::Shell* shell_;
   scoped_refptr<MediaLog> media_log_;
 };