media: Cleanup class/struct forward declarations

media/base/pipeline.h

 // Copyright (c) 2012 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_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "media/base/buffering_state.h"
 #include "media/base/cdm_context.h"
 #include "media/base/media_export.h"
 #include "media/base/media_track.h"
 #include "media/base/pipeline_metadata.h"
 #include "media/base/pipeline_status.h"
 #include "media/base/ranges.h"
 #include "media/base/text_track.h"
 #include "media/base/video_rotation.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace media {
 
 class Demuxer;
 class Renderer;
-class VideoFrame;
 
 class MEDIA_EXPORT Pipeline {
  public:
   class Client {
    public:
     // Executed whenever an error occurs except when the error occurs during
     // Start/Seek/Resume or Suspend. Those errors are reported via |seek_cb|
     // and |suspend_cb| respectively.
     virtual void OnError(PipelineStatus status) = 0;
 
@@ skipping 129 matching lines @@
   // Gets the current pipeline statistics.
   virtual PipelineStatistics GetStatistics() const = 0;
 
   virtual void SetCdm(CdmContext* cdm_context,
                       const CdmAttachedCB& cdm_attached_cb) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_