Let Contraints Controll Mute/Unmute Audio Local Playback For Desktop Sharing

content/browser/media/capture/web_contents_video_capture_device.h

Index: content/browser/media/capture/web_contents_video_capture_device.h
diff --git a/content/browser/media/capture/web_contents_video_capture_device.h b/content/browser/media/capture/web_contents_video_capture_device.h
index 6bcddfa98dd70225f822c952d1dd8ac22cd9797c..6063f7e1fb3d8b090aa705826faab176477f42b5 100644
--- a/content/browser/media/capture/web_contents_video_capture_device.h
+++ b/content/browser/media/capture/web_contents_video_capture_device.h
@@ -30,7 +30,8 @@ class CONTENT_EXPORT WebContentsVideoCaptureDevice
  public:
   // Create a WebContentsVideoCaptureDevice instance from the given
   // |device_id|.  Returns NULL if |device_id| is invalid.
-  static media::VideoCaptureDevice* Create(const std::string& device_id);
+  static std::unique_ptr<media::VideoCaptureDevice> Create(
+      const std::string& device_id);
 
   ~WebContentsVideoCaptureDevice() override;