Adds AudioDevice factory for all audio clients in Chrome

content/renderer/media/audio_device.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.
 //
 // Audio rendering unit utilizing audio output stream provided by browser
 // process through IPC.
 //
 // Relationship of classes.
 //
 //  AudioOutputController                AudioDevice
@@ skipping 69 matching lines @@
 class AudioParameters;
 }
 
 class CONTENT_EXPORT AudioDevice
     : NON_EXPORTED_BASE(public media::AudioRendererSink),
       public AudioMessageFilter::Delegate,
       NON_EXPORTED_BASE(public ScopedLoopObserver) {
  public:
   // Methods called on main render thread -------------------------------------
 
-  // Minimal constructor where Initialize() must be called later.
+  // Creates an uninitialized AudioDevice. Clients must call Initialize()
+  // before using.
   AudioDevice();
 
-  AudioDevice(const media::AudioParameters& params, RenderCallback* callback);
-
   // AudioRendererSink implementation.
   virtual void Initialize(const media::AudioParameters& params,
                           RenderCallback* callback) OVERRIDE;
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Play() OVERRIDE;
   virtual void Pause(bool flush) OVERRIDE;
   virtual bool SetVolume(double volume) OVERRIDE;
   virtual void GetVolume(double* volume) OVERRIDE;
 
@@ skipping 56 matching lines @@
   // guard to control stopping and starting the audio thread.
   base::Lock audio_thread_lock_;
   AudioDeviceThread audio_thread_;
   scoped_ptr<AudioDevice::AudioThreadCallback> audio_callback_;
 
 
   DISALLOW_COPY_AND_ASSIGN(AudioDevice);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_H_