Remove media::FilterCollection::Clear() because no one calls it.

media/base/filter_collection.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_FILTER_COLLECTION_H_
 #define MEDIA_BASE_FILTER_COLLECTION_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
@@ skipping 16 matching lines @@
 
   void SetDemuxer(const scoped_refptr<Demuxer>& demuxer);
   const scoped_refptr<Demuxer>& GetDemuxer();
 
   void SetAudioRenderer(scoped_ptr<AudioRenderer> audio_renderer);
   scoped_ptr<AudioRenderer> GetAudioRenderer();
 
   void SetVideoRenderer(scoped_ptr<VideoRenderer> video_renderer);
   scoped_ptr<VideoRenderer> GetVideoRenderer();
 
-  // Remove remaining filters.
-  void Clear();
-
  private:
   scoped_refptr<Demuxer> demuxer_;
   scoped_ptr<AudioRenderer> audio_renderer_;
   scoped_ptr<VideoRenderer> video_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(FilterCollection);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTER_COLLECTION_H_