handle the case when device is closed before media pipeline is fully initialized.

content/browser/renderer_host/media/video_capture_host.h

Index: content/browser/renderer_host/media/video_capture_host.h
===================================================================
--- content/browser/renderer_host/media/video_capture_host.h	(revision 137680)
+++ content/browser/renderer_host/media/video_capture_host.h	(working copy)
@@ -78,6 +78,7 @@
                            int width,
                            int height,
                            int frame_per_second) OVERRIDE;
+  virtual void OnPaused(const VideoCaptureControllerID& id) OVERRIDE;
   virtual void OnReadyToDelete(const VideoCaptureControllerID& id) OVERRIDE;
 
  private:
@@ -137,6 +138,8 @@
   // Handle error coming from VideoCaptureDevice.
   void DoHandleError(int device_id);
 
+  void DoPaused(int device_id);
+
   // Helpers.
   media_stream::VideoCaptureManager* GetVideoCaptureManager();