media: Cleanup class/struct forward declarations

media/base/renderer.h

 // Copyright 2014 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_RENDERER_H_
 #define MEDIA_BASE_RENDERER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #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/pipeline_status.h"
 
 namespace media {
 
 class DemuxerStreamProvider;
 class RendererClient;
-class VideoFrame;
 
 class MEDIA_EXPORT Renderer {
  public:
   Renderer();
 
   // Stops rendering and fires any pending callbacks.
   virtual ~Renderer();
 
   // Initializes the Renderer with |demuxer_stream_provider|, executing
   // |init_cb| upon completion. |demuxer_stream_provider| must be valid for
@@ skipping 32 matching lines @@
   // Returns whether |this| renders video.
   virtual bool HasVideo() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Renderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_RENDERER_H_