blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 24 matching lines @@
 #include "public/platform/WebMediaConstraints.h"
 #include "wtf/Forward.h"
 #include <memory>
 
 namespace blink {
 
 class AudioSourceProvider;
 class ExceptionState;
 class MediaTrackConstraints;
 class MediaStream;
-class MediaStreamTrackSourcesCallback;
 class MediaTrackSettings;
 
 class MODULES_EXPORT MediaStreamTrack : public EventTargetWithInlineData,
                                         public ActiveScriptWrappable,
                                         public ActiveDOMObject,
                                         public MediaStreamSource::Observer {
   USING_GARBAGE_COLLECTED_MIXIN(MediaStreamTrack);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
@@ skipping 63 matching lines @@
   bool m_stopped;
   Member<MediaStreamComponent> m_component;
   WebMediaConstraints m_constraints;
 };
 
 typedef HeapVector<Member<MediaStreamTrack>> MediaStreamTrackVector;
 
 }  // namespace blink
 
 #endif  // MediaStreamTrack_h