Remove unused RenderIO() interface.

media/base/audio_renderer_sink.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_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_AUDIO_RENDERER_SINK_H_
 
 #include <vector>
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 10 matching lines @@
 
 class AudioRendererSink
     : public base::RefCountedThreadSafe<media::AudioRendererSink> {
  public:
   class RenderCallback {
    public:
     // Attempts to completely fill all channels of |dest|, returns actual
     // number of frames filled.
     virtual int Render(AudioBus* dest, int audio_delay_milliseconds) = 0;
 
-    // Synchronized audio I/O - see InitializeIO() below.
-    virtual void RenderIO(AudioBus* source,
-                          AudioBus* dest,
-                          int audio_delay_milliseconds) {}
-
     // Signals an error has occurred.
     virtual void OnRenderError() = 0;
 
    protected:
     virtual ~RenderCallback() {}
   };
 
   // Sets important information about the audio stream format.
   // It must be called before any of the other methods.
   virtual void Initialize(const AudioParameters& params,
@@ skipping 16 matching lines @@
   virtual bool SetVolume(double volume) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<AudioRendererSink>;
   virtual ~AudioRendererSink() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_SINK_H_