media: remove unused functions: Renderer::HasAudio()/HasVideo()

media/base/renderer.h

 // Copyright 2014 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_RENDERER_H_
 #define MEDIA_BASE_RENDERER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 39 matching lines @@
 
   // Updates the current playback rate. The default playback rate should be 0.
   virtual void SetPlaybackRate(double playback_rate) = 0;
 
   // Sets the output volume. The default volume should be 1.
   virtual void SetVolume(float volume) = 0;
 
   // Returns the current media time.
   virtual base::TimeDelta GetMediaTime() = 0;
 
-  // Returns whether |this| renders audio.
-  virtual bool HasAudio() = 0;
-
-  // Returns whether |this| renders video.
-  virtual bool HasVideo() = 0;
-
  private:
   DISALLOW_COPY_AND_ASSIGN(Renderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_RENDERER_H_