Almost done: ApplicationDelegate -> ApplicationImplBase conversion.

services/media/factory_service/audio_track_controller.h

 // Copyright 2016 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 SERVICES_MEDIA_FACTORY_SERVICE_AUDIO_TRACK_CONTROLLER_H_
 #define SERVICES_MEDIA_FACTORY_SERVICE_AUDIO_TRACK_CONTROLLER_H_
 
-#include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/services/media/audio/interfaces/audio_track.mojom.h"
 #include "mojo/services/media/common/interfaces/media_transport.mojom.h"
 #include "services/media/framework/types/stream_type.h"
 
 namespace mojo {
+
+class Shell;
+
 namespace media {
 
 // Controls an audio track.
 class AudioTrackController {
  public:
   using GetSupportedMediaTypesCallback = std::function<void(
       std::unique_ptr<std::vector<std::unique_ptr<StreamTypeSet>>>)>;
   using ConfigureCallback = std::function<void(MediaConsumerPtr)>;
 
-  AudioTrackController(const String& url, ApplicationImpl* app);
+  AudioTrackController(const String& url, Shell* shell);
 
   ~AudioTrackController();
 
   // Gets the media types supported by the audio track.
   void GetSupportedMediaTypes(const GetSupportedMediaTypesCallback& callback);
 
   // Configures the controller.
   void Configure(const std::unique_ptr<StreamType>& stream_type,
                  const ConfigureCallback& callback);
 
   // Gets the timeline control site for the audio track.
   void GetTimelineControlSite(InterfaceRequest<MediaTimelineControlSite> req);
 
  private:
   AudioTrackPtr audio_track_;
 };
 
 }  // namespace media
 }  // namespace mojo
 
 #endif  // SERVICES_MEDIA_FACTORY_SERVICE_AUDIO_TRACK_CONTROLLER_H_