content: Cleanup class/struct forward declarations

content/renderer/pepper/video_decoder_shim.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 CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
 #define CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <queue>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "media/base/video_decoder_config.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ppapi/c/pp_codecs.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
-namespace gpu {
-namespace gles2 {
-class GLES2Interface;
-}
-}
-
-namespace media {
-class DecoderBuffer;
-}
-
 namespace content {
 
 class ContextProviderCommandBuffer;
 class PepperVideoDecoderHost;
 
 // This class is a shim to wrap a media::VideoDecoder so that it can be used
 // by PepperVideoDecoderHost in place of a media::VideoDecodeAccelerator.
 // This class should be constructed, used, and destructed on the main (render)
 // thread.
 class VideoDecoderShim : public media::VideoDecodeAccelerator {
@@ skipping 72 matching lines @@
   std::unique_ptr<YUVConverter> yuv_converter_;
 
   base::WeakPtrFactory<VideoDecoderShim> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoDecoderShim);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_