RefCounted types should not have public destructors, media/ and gpu/ edition

media/audio/null_audio_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_FILTERS_NULL_AUDIO_RENDERER_H_
 #define MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
 
 // NullAudioSink effectively uses an extra thread to "throw away" the
 // audio data at a rate resembling normal playback speed.  It's just like
 // decoding to /dev/null!
 //
 // NullAudioSink can also be used in situations where the client has no
 // audio device or we haven't written an audio implementation for a particular
 // platform yet.
 
 #include <vector>
 
 #include "base/threading/thread.h"
 #include "media/base/audio_renderer_sink.h"
 
 namespace media {
 
 class MEDIA_EXPORT NullAudioSink
     : NON_EXPORTED_BASE(public AudioRendererSink) {
  public:
   NullAudioSink();
-  virtual ~NullAudioSink();
 
   // AudioRendererSink implementation.
   virtual void Initialize(const AudioParameters& params,
                           RenderCallback* callback) OVERRIDE;
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Pause(bool flush) OVERRIDE;
   virtual void Play() OVERRIDE;
   virtual void SetPlaybackRate(float rate) OVERRIDE;
   virtual bool SetVolume(double volume) OVERRIDE;
   virtual void GetVolume(double* volume) OVERRIDE;
 
+ protected:
+  virtual ~NullAudioSink();
+
  private:
   // Audio thread task that periodically calls FillBuffer() to consume
   // audio data.
   void FillBufferTask();
 
   void SetPlaying(bool is_playing);
 
   // A buffer passed to FillBuffer to advance playback.
   std::vector<float*> audio_data_;
 
   AudioParameters params_;
   bool initialized_;
   float playback_rate_;
   bool playing_;
   RenderCallback* callback_;
 
   // Separate thread used to throw away data.
   base::Thread thread_;
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_