Clean forward declaration in public

public/platform/WebMediaPlayerClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #ifndef WebMediaPlayerClient_h
 #define WebMediaPlayerClient_h
 
 #include "WebMediaPlayer.h"
 
 namespace blink {
 
 class WebInbandTextTrack;
 class WebLayer;
 class WebMediaSource;
-class WebPlugin;
-class WebRequest;
 class WebURL;
 
 class WebMediaPlayerClient {
 public:
     enum MediaKeyErrorCode {
         MediaKeyErrorCodeUnknown = 1,
         MediaKeyErrorCodeClient,
         MediaKeyErrorCodeService,
         MediaKeyErrorCodeOutput,
         MediaKeyErrorCodeHardwareChange,
@@ skipping 45 matching lines @@
     virtual void connectedToRemoteDevice() = 0;
     virtual void disconnectedFromRemoteDevice() = 0;
 
 protected:
     ~WebMediaPlayerClient() { }
 };
 
 } // namespace blink
 
 #endif