Remove dead code related to media device enumerations and monitoring.

chrome/browser/media/webrtc/media_stream_devices_controller.cc

Index: chrome/browser/media/webrtc/media_stream_devices_controller.cc
diff --git a/chrome/browser/media/webrtc/media_stream_devices_controller.cc b/chrome/browser/media/webrtc/media_stream_devices_controller.cc
index 2bf826790c38b8db82a3f43556ccc0e2198646bc..e885c4752bb8750fbd15b0d9942f413389285c83 100644
--- a/chrome/browser/media/webrtc/media_stream_devices_controller.cc
+++ b/chrome/browser/media/webrtc/media_stream_devices_controller.cc
@@ -423,11 +423,6 @@ content::MediaStreamDevices MediaStreamDevicesController::GetDevices(
           profile_, audio_allowed, video_allowed, &devices);
       break;
     }
-    case content::MEDIA_ENUMERATE_DEVICES: {
-      // Do nothing.
-      NOTREACHED();
-      break;
-    }
   }  // switch
 
   if (audio_allowed) {