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

media/filters/ffmpeg_video_decoder.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_FILTERS_FFMPEG_VIDEO_DECODER_H_
 #define MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
 
 #include <deque>
 
 #include "media/base/filters.h"
 #include "media/base/pts_stream.h"
 #include "media/video/video_decode_engine.h"
 #include "ui/gfx/size.h"
 
+class MessageLoop;
+
 namespace media {
 
 class VideoDecodeEngine;
 
 class MEDIA_EXPORT FFmpegVideoDecoder
     : public VideoDecoder,
       public VideoDecodeEngine::EventHandler {
  public:
-  FFmpegVideoDecoder(MessageLoop* message_loop,
-                     VideoDecodeContext* decode_context);
+  explicit FFmpegVideoDecoder(MessageLoop* message_loop);
   virtual ~FFmpegVideoDecoder();
 
   // Filter implementation.
   virtual void Stop(const base::Closure& callback) OVERRIDE;
   virtual void Seek(base::TimeDelta time, const FilterStatusCB& cb) OVERRIDE;
   virtual void Pause(const base::Closure& callback) OVERRIDE;
   virtual void Flush(const base::Closure& callback) OVERRIDE;
 
-  // Decoder implementation.
+  // VideoDecoder implementation.
   virtual void Initialize(DemuxerStream* demuxer_stream,
                           const base::Closure& callback,
                           const StatisticsCallback& stats_callback) OVERRIDE;
   virtual void ProduceVideoFrame(
       scoped_refptr<VideoFrame> video_frame) OVERRIDE;
   virtual gfx::Size natural_size() OVERRIDE;
 
  private:
   // VideoDecodeEngine::EventHandler interface.
   virtual void OnInitializeComplete(bool success) OVERRIDE;
@@ skipping 30 matching lines @@
 
   // Injection point for unittest to provide a mock engine.  Takes ownership of
   // the provided engine.
   virtual void SetVideoDecodeEngineForTest(VideoDecodeEngine* engine);
 
   MessageLoop* message_loop_;
 
   PtsStream pts_stream_;  // Stream of presentation timestamps.
   DecoderState state_;
   scoped_ptr<VideoDecodeEngine> decode_engine_;
-  scoped_ptr<VideoDecodeContext> decode_context_;
 
   base::Closure initialize_callback_;
   base::Closure uninitialize_callback_;
   base::Closure flush_callback_;
   FilterStatusCB seek_cb_;
   StatisticsCallback statistics_callback_;
 
   // Hold video frames when flush happens.
   std::deque<scoped_refptr<VideoFrame> > frame_queue_flushed_;
 
   // TODO(scherkus): I think this should be calculated by VideoRenderers based
   // on information provided by VideoDecoders (i.e., aspect ratio).
   gfx::Size natural_size_;
 
   // Pointer to the demuxer stream that will feed us compressed buffers.
   scoped_refptr<DemuxerStream> demuxer_stream_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_