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

media/video/ffmpeg_video_decode_engine.cc

 // 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.
 
 #include "media/video/ffmpeg_video_decode_engine.h"
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
 #include "base/task.h"
 #include "media/base/buffers.h"
 #include "media/base/limits.h"
 #include "media/base/media_switches.h"
 #include "media/base/pipeline.h"
 #include "media/base/video_util.h"
 #include "media/ffmpeg/ffmpeg_common.h"
-#include "media/filters/ffmpeg_demuxer.h"
 
 namespace media {
 
 FFmpegVideoDecodeEngine::FFmpegVideoDecodeEngine()
     : codec_context_(NULL),
       event_handler_(NULL),
       frame_rate_numerator_(0),
       frame_rate_denominator_(0),
       pending_input_buffers_(0),
       pending_output_buffers_(0),
       output_eos_reached_(false),
       flush_pending_(false) {
 }
 
 FFmpegVideoDecodeEngine::~FFmpegVideoDecodeEngine() {
   if (codec_context_) {
     av_free(codec_context_->extradata);
     avcodec_close(codec_context_);
     av_free(codec_context_);
   }
 }
 
 void FFmpegVideoDecodeEngine::Initialize(
-    MessageLoop* message_loop,
     VideoDecodeEngine::EventHandler* event_handler,
-    VideoDecodeContext* context,
     const VideoDecoderConfig& config) {
   frame_rate_numerator_ = config.frame_rate_numerator();
   frame_rate_denominator_ = config.frame_rate_denominator();
 
   // Always try to use three threads for video decoding.  There is little reason
   // not to since current day CPUs tend to be multi-core and we measured
   // performance benefits on older machines such as P4s with hyperthreading.
   //
   // Handling decoding on separate threads also frees up the pipeline thread to
   // continue processing. Although it'd be nice to have the option of a single
@@ skipping 235 matching lines @@
   DCHECK_EQ(output_eos_reached_, false);
   pending_input_buffers_++;
   event_handler_->ProduceVideoSample(NULL);
 }
 
 }  // namespace media
 
 // Disable refcounting for this object because this object only lives
 // on the video decoder thread and there's no need to refcount it.
 DISABLE_RUNNABLE_METHOD_REFCOUNT(media::FFmpegVideoDecodeEngine);