Remove VideoDecoder::PrepareForShutdownHack() and friends.

media/base/video_renderer.h

 // Copyright (c) 2012 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_BASE_VIDEO_RENDERER_H_
 #define MEDIA_BASE_VIDEO_RENDERER_H_
 
 #include <list>
 
 #include "base/callback.h"
@@ skipping 73 matching lines @@
   virtual void Preroll(base::TimeDelta time,
                        const PipelineStatusCB& callback) = 0;
 
   // Stop all operations in preparation for being deleted, executing |callback|
   // when complete.
   virtual void Stop(const base::Closure& callback) = 0;
 
   // Updates the current playback rate.
   virtual void SetPlaybackRate(float playback_rate) = 0;
 
-  // Prepare decoder for shutdown.  This is a HACK needed because
-  // PipelineImpl::Stop() goes through a Pause/Flush/Stop dance to all its
-  // filters, waiting for each state transition to complete before starting the
-  // next, but WebMediaPlayerImpl::Destroy() holds the renderer loop hostage for
-  // the duration. http://crbug.com/110228 tracks removing this.
-  virtual void PrepareForShutdownHack() = 0;
-
  protected:
   friend class base::RefCountedThreadSafe<VideoRenderer>;
 
   VideoRenderer();
   virtual ~VideoRenderer();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_RENDERER_H_