Adds AudioDevice factory for all audio clients in Chrome

content/renderer/media/audio_device.h

Index: content/renderer/media/audio_device.h
diff --git a/content/renderer/media/audio_device.h b/content/renderer/media/audio_device.h
index 74b28d33d8558d2a8ed97f03f7ff0d5ecc6a23d3..adce14333cdd57a20fb672c86031ffc8c6ab325b 100644
--- a/content/renderer/media/audio_device.h
+++ b/content/renderer/media/audio_device.h
@@ -87,11 +87,10 @@ class CONTENT_EXPORT AudioDevice
  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;