Remove media::VideoDecodeContext as it has no implementation and is unused.

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 <deque>
 
 #include "base/memory/scoped_ptr.h"
 #include "media/ffmpeg/ffmpeg_common.h"
 #include "media/video/video_decode_engine.h"
 
 // FFmpeg types.
 struct AVCodecContext;
 struct AVFrame;
 
 namespace media {
 
 class MEDIA_EXPORT FFmpegVideoDecodeEngine : public VideoDecodeEngine {
  public:
   FFmpegVideoDecodeEngine();
   virtual ~FFmpegVideoDecodeEngine();
 
   // Implementation of the VideoDecodeEngine Interface.
-  virtual void Initialize(MessageLoop* message_loop,
-                          VideoDecodeEngine::EventHandler* event_handler,
-                          VideoDecodeContext* context,
+  virtual void Initialize(VideoDecodeEngine::EventHandler* event_handler,
                           const VideoDecoderConfig& config);
   virtual void ConsumeVideoSample(scoped_refptr<Buffer> buffer);
   virtual void ProduceVideoFrame(scoped_refptr<VideoFrame> frame);
   virtual void Uninitialize();
   virtual void Flush();
   virtual void Seek();
 
  private:
   void DecodeFrame(scoped_refptr<Buffer> buffer);
   void ReadInput();
@@ skipping 25 matching lines @@
 
   // Whether flush operation is pending.
   bool flush_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecodeEngine);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_FFMPEG_VIDEO_DECODE_ENGINE_H_