Almost done: ApplicationDelegate -> ApplicationImplBase conversion.

services/media/factory_service/audio_track_controller.cc

 // 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.
 
 #include <list>
 
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/services/media/audio/interfaces/audio_server.mojom.h"
 #include "mojo/services/media/audio/interfaces/audio_track.mojom.h"
 #include "services/media/factory_service/audio_track_controller.h"
 #include "services/media/framework_mojo/mojo_type_conversions.h"
 
 namespace mojo {
 namespace media {
 
-AudioTrackController::AudioTrackController(const String& url,
-                                           ApplicationImpl* app) {
+AudioTrackController::AudioTrackController(const String& url, Shell* shell) {
   // TODO(dalesat): Handle connection errors.
-  DCHECK(app);
+  DCHECK(shell);
 
   AudioServerPtr audio_server;
-  ConnectToService(app->shell(), url, GetProxy(&audio_server));
+  ConnectToService(shell, url, GetProxy(&audio_server));
   audio_server->CreateTrack(GetProxy(&audio_track_));
 }
 
 AudioTrackController::~AudioTrackController() {}
 
 void AudioTrackController::GetSupportedMediaTypes(
     const GetSupportedMediaTypesCallback& callback) {
   // Query the track's format capabilities.
   audio_track_->Describe([this, callback](AudioTrackDescriptorPtr descriptor) {
     callback(descriptor->supported_media_types.To<std::unique_ptr<
@@ skipping 13 matching lines @@
   callback(consumer.Pass());
 }
 
 void AudioTrackController::GetTimelineControlSite(
     InterfaceRequest<MediaTimelineControlSite> req) {
   audio_track_->GetTimelineControlSite(req.Pass());
 }
 
 }  // namespace media
 }  // namespace mojo