Makes AudioOutputDispatcher non-ref-counted.

media/audio/audio_output_dispatcher.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.
 
 // AudioOutputDispatcher is a single-threaded base class that dispatches
 // creation and deletion of audio output streams. AudioOutputProxy objects use
 // this class to allocate and recycle actual audio output streams. When playback
 // is started, the proxy calls StartStream() to get an output stream that it
 // uses to play audio. When playback is stopped, the proxy returns the stream
 // back to the dispatcher by calling StopStream().
 //
 // AudioManagerBase creates one specialization of AudioOutputDispatcher on the
 // audio thread for each possible set of audio parameters. I.e streams with
 // different parameters are managed independently.  The AudioOutputDispatcher
 // instance is then deleted on the audio thread when the AudioManager shuts
 // down.
 
 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_H_
 
 #include "base/macros.h"
-#include "base/memory/ref_counted.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_manager.h"
 #include "media/base/audio_parameters.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 
 class AudioOutputProxy;
 
-class MEDIA_EXPORT AudioOutputDispatcher
-    : public base::RefCountedThreadSafe<AudioOutputDispatcher> {
+class MEDIA_EXPORT AudioOutputDispatcher {
  public:
   AudioOutputDispatcher(AudioManager* audio_manager,
                         const AudioParameters& params,
                         const std::string& device_id);
+  virtual ~AudioOutputDispatcher();
 
   // Called by AudioOutputProxy to open the stream.
   // Returns false, if it fails to open it.
   virtual bool OpenStream() = 0;
 
   // Called by AudioOutputProxy when the stream is started.
   // Uses |callback| to get source data and report errors, if any.
   // Does *not* take ownership of this callback.
   // Returns true if started successfully, false otherwise.
   virtual bool StartStream(AudioOutputStream::AudioSourceCallback* callback,
                            AudioOutputProxy* stream_proxy) = 0;
 
   // Called by AudioOutputProxy when the stream is stopped.
   // Ownership of the |stream_proxy| is passed to the dispatcher.
   virtual void StopStream(AudioOutputProxy* stream_proxy) = 0;
 
   // Called by AudioOutputProxy when the volume is set.
   virtual void StreamVolumeSet(AudioOutputProxy* stream_proxy,
                                double volume) = 0;
 
   // Called by AudioOutputProxy when the stream is closed.
   virtual void CloseStream(AudioOutputProxy* stream_proxy) = 0;
 
-  // Called on the audio thread when the AudioManager is shutting down.
-  virtual void Shutdown() = 0;
-
   const std::string& device_id() const { return device_id_; }
 
  protected:
-  friend class base::RefCountedThreadSafe<AudioOutputDispatcher>;
-  virtual ~AudioOutputDispatcher();
-
   // A no-reference-held pointer (we don't want circular references) back to the
   // AudioManager that owns this object.
   AudioManager* audio_manager_;
   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   const AudioParameters params_;
   std::string device_id_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioOutputDispatcher);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_H_