media: Cleanup class/struct forward declarations

media/cast/cast_sender_impl.h

 // Copyright 2013 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.
 #ifndef MEDIA_CAST_CAST_SENDER_IMPL_H_
 #define MEDIA_CAST_CAST_SENDER_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/cast_sender.h"
 #include "media/cast/sender/audio_sender.h"
 #include "media/cast/sender/video_sender.h"
 
 namespace media {
-class VideoFrame;
 
 namespace cast {
 class AudioSender;
 class VideoSender;
 
 // This class combines all required sending objects such as the audio and video
 // senders, pacer, packet receiver and frame input.
 class CastSenderImpl : public CastSender {
  public:
   CastSenderImpl(scoped_refptr<CastEnvironment> cast_environment,
@@ skipping 33 matching lines @@
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<CastSenderImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CastSenderImpl);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_CAST_SENDER_IMPL_H_