Refactored extensionOptions to use the new guestViewAttributes module.

extensions/renderer/resources/guest_view/extension_view/extension_view.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.
 
 // This module implements the ExtensionView <extensionview>.
 
 var GuestViewContainer = require('guestViewContainer').GuestViewContainer;
 var ExtensionViewConstants =
     require('extensionViewConstants').ExtensionViewConstants;
 var ExtensionViewEvents = require('extensionViewEvents').ExtensionViewEvents;
 var ExtensionViewInternal =
     require('extensionViewInternal').ExtensionViewInternal;
 
 function ExtensionViewImpl(extensionviewElement) {
   GuestViewContainer.call(this, extensionviewElement, 'extensionview');
-  this.setupExtensionViewAttributes();
 
   new ExtensionViewEvents(this, this.viewInstanceId);
 }
 
 ExtensionViewImpl.prototype.__proto__ = GuestViewContainer.prototype;
 
 ExtensionViewImpl.VIEW_TYPE = 'ExtensionView';
 
 ExtensionViewImpl.setupElement = function(proto) {
   var apiMethods = ExtensionViewImpl.getApiMethods();
 
   GuestViewContainer.forwardApiMethods(proto, apiMethods);
 };
 
 ExtensionViewImpl.prototype.createGuest = function() {
   this.guest.create(this.buildParams(), function() {
     this.attachWindow();
   }.bind(this));
 };
 
 ExtensionViewImpl.prototype.buildContainerParams = function() {
   var params = {};
   for (var i in this.attributes) {
     params[i] = this.attributes[i].getValue();
   }
   return params;
 };
 
-// This observer monitors mutations to attributes of the <extensionview>.
-ExtensionViewImpl.prototype.handleAttributeMutation = function(
-    attributeName, oldValue, newValue) {
-  if (!this.attributes[attributeName])
-    return;
-
-  // Let the changed attribute handle its own mutation.
-  this.attributes[attributeName].maybeHandleMutation(oldValue, newValue);
-};
-
 ExtensionViewImpl.prototype.onElementDetached = function() {
   this.guest.destroy();
 
   // Reset all attributes.
   for (var i in this.attributes) {
     this.attributes[i].setValueIgnoreMutation();
   }
 };
 
 // Updates src upon loadcommit.
 ExtensionViewImpl.prototype.onLoadCommit = function(url) {
   this.attributes[ExtensionViewConstants.ATTRIBUTE_SRC].
       setValueIgnoreMutation(url);
 };
 
 GuestViewContainer.registerElement(ExtensionViewImpl);
 
 // Exports.
 exports.ExtensionViewImpl = ExtensionViewImpl;