Collapse FFmpegVideoDecodeEngine into FFmpegVideoDecoder and remove VideoDecodeEngine.

media/video/ffmpeg_video_decode_engine.h

-// Copyright (c) 2011 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_VIDEO_FFMPEG_VIDEO_DECODE_ENGINE_H_
-#define MEDIA_VIDEO_FFMPEG_VIDEO_DECODE_ENGINE_H_
-
-#include "base/compiler_specific.h"
-#include "media/video/video_decode_engine.h"
-
-struct AVCodecContext;
-struct AVFrame;
-
-namespace media {
-
-class MEDIA_EXPORT FFmpegVideoDecodeEngine : public VideoDecodeEngine {
- public:
-  FFmpegVideoDecodeEngine();
-  virtual ~FFmpegVideoDecodeEngine();
-
-  // VideoDecodeEngine implementation.
-  virtual bool Initialize(const VideoDecoderConfig& config) OVERRIDE;
-  virtual void Uninitialize() OVERRIDE;
-  virtual bool Decode(const scoped_refptr<Buffer>& buffer,
-                      scoped_refptr<VideoFrame>* video_frame) OVERRIDE;
-  virtual void Flush() OVERRIDE;
-
- private:
-  // Allocates a video frame based on the current format and dimensions based on
-  // the current state of |codec_context_|.
-  scoped_refptr<VideoFrame> AllocateVideoFrame();
-
-  // FFmpeg structures owned by this object.
-  AVCodecContext* codec_context_;
-  AVFrame* av_frame_;
-
-  // Frame rate of the video.
-  int frame_rate_numerator_;
-  int frame_rate_denominator_;
-
-  DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecodeEngine);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_VIDEO_FFMPEG_VIDEO_DECODE_ENGINE_H_