Get rid of {Run,Terminate}MainApplication(), and more ApplicationDelegate conversion.

examples/audio_play_test/play_tone.cc

 // Copyright 2015 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 <math.h>
 #include <memory>
 
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_impl_base.h"
 #include "mojo/public/cpp/application/connect.h"
@@ skipping 225 matching lines @@
   RunLoop::current()->Quit();
 }
 
 }  // namespace examples
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle app_request) {
   mojo::media::audio::examples::PlayToneApp play_tone_app;
-  return mojo::RunMainApplication(app_request, &play_tone_app);
+  return mojo::RunApplication(app_request, &play_tone_app);
 }