use control message instead of routed for video capture

content/browser/renderer_host/media/video_capture_controller_event_handler.h

Index: content/browser/renderer_host/media/video_capture_controller_event_handler.h
===================================================================
--- content/browser/renderer_host/media/video_capture_controller_event_handler.h	(revision 89543)
+++ content/browser/renderer_host/media/video_capture_controller_event_handler.h	(working copy)
@@ -10,11 +10,10 @@
 
 // ID used for identifying an object of VideoCaptureController.
 struct VideoCaptureControllerID {
-  VideoCaptureControllerID(int32 routing_id, int device_id);
+  VideoCaptureControllerID(int device_id);
 
   bool operator<(const VideoCaptureControllerID& vc) const;
 
-  int32 routing_id;
   int device_id;
 };