extensionview: Fix onLoadCommit TypeError.

extensions/renderer/resources/guest_view/extension_view/extension_view_events.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.
 
 // Event management for ExtensionView.
 
 var CreateEvent = require('guestViewEvents').CreateEvent;
 var GuestViewEvents = require('guestViewEvents').GuestViewEvents;
 
 function ExtensionViewEvents(extensionViewImpl) {
   GuestViewEvents.call(this, extensionViewImpl);
 }
 
 ExtensionViewEvents.prototype.__proto__ = GuestViewEvents.prototype;
 
 ExtensionViewEvents.EVENTS = {
   'loadcommit': {
     evt: CreateEvent('extensionViewInternal.onLoadCommit'),
     handler: 'handleLoadCommitEvent',
     internal: true
   }
 };
 
 ExtensionViewEvents.prototype.getEvents = function() {
   return ExtensionViewEvents.EVENTS;
 };
 
 ExtensionViewEvents.prototype.handleLoadCommitEvent = function(event) {
-  this.extensionViewImpl.onLoadCommit(event.url);
+  this.view.onLoadCommit(event.url);
 };
 
 exports.ExtensionViewEvents = ExtensionViewEvents;