[Media Router] Fix typo in media_router_bindings.js

extensions/renderer/resources/media_router_bindings.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var mediaRouter;
 
 define('media_router_bindings', [
     'mojo/public/js/bindings',
     'mojo/public/js/core',
     'content/public/renderer/frame_service_registry',
@@ skipping 452 matching lines @@
     /**
      * TODO(imcheng): Remove in M55 (crbug.com/626395).
      * @type {function(string):
      *     Promise.<{messages: Array.<RouteMessage>, error: boolean}>}
      */
     this.listenForRouteMessages = null;
 
     /**
      * @type {function(string)}
      */
-    this.startlisteningForRouteMessages = null;
+    this.startListeningForRouteMessages = null;
 
     /**
      * @type {function(string)}
      */
     this.stopListeningForRouteMessages = null;
 
     /**
      * @type {function(string)}
      */
     this.detachRoute = null;
@@ skipping 373 matching lines @@
   };
 
   mediaRouter = new MediaRouter(connector.bindHandleToProxy(
       serviceProvider.connectToService(
           mediaRouterMojom.MediaRouter.name),
       mediaRouterMojom.MediaRouter));
 
   return mediaRouter;
 });