Clean up forward declarations in Source/web

Source/web/WebMediaPlayerClientImpl.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 27 matching lines @@
 #include "platform/weborigin/KURL.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/ThreadingPrimitives.h"
 
 namespace blink {
 
 class AudioSourceProviderClient;
 class HTMLMediaElement;
 class WebAudioSourceProvider;
-class WebContentDecryptionModule;
 class WebMediaPlayer;
 
 // This class serves as a bridge between MediaPlayer and
 // WebMediaPlayer.
 class WebMediaPlayerClientImpl final : public MediaPlayer, public WebMediaPlayerClient {
 
 public:
     static PassOwnPtr<MediaPlayer> create(MediaPlayerClient*);
 
     virtual ~WebMediaPlayerClientImpl();
@@ skipping 93 matching lines @@
         Mutex provideInputLock;
     };
 
     AudioSourceProviderImpl m_audioSourceProvider;
 #endif
 };
 
 } // namespace blink
 
 #endif