Destroy MojoMediaClient in MojoMediaApplication::OnStop().

media/mojo/services/mojo_media_client.h

Index: media/mojo/services/mojo_media_client.h
diff --git a/media/mojo/services/mojo_media_client.h b/media/mojo/services/mojo_media_client.h
index caf813edbb593eb23d23dc9046c141947930d256..f07d4c4f461ae71b779677ec67149f79a127c1c1 100644
--- a/media/mojo/services/mojo_media_client.h
+++ b/media/mojo/services/mojo_media_client.h
@@ -33,16 +33,14 @@ class VideoRendererSink;
 
 class MEDIA_MOJO_EXPORT MojoMediaClient {
  public:
+  // Called before the host application is scheduled to quit.
+  // The application message loop is still valid at this point, so all clean
+  // up tasks requiring the message loop must be completed before returning.
   virtual ~MojoMediaClient();
 
   // Called exactly once before any other method.
   virtual void Initialize();
 
-  // Called before the host application is scheduled to quit.
-  // The application message loop is still valid at this point, so all clean
-  // up tasks requiring the message loop must be completed before returning.
-  virtual void WillQuit();
-
   virtual std::unique_ptr<AudioDecoder> CreateAudioDecoder(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);