<webview> + <extensionview>: Generalize setValueIgnoreMutation

extensions/renderer/resources/guest_view/extension_view_attributes.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 attributes of the <extensionview> tag.
 
 var GuestViewInternal =
     require('binding').Binding.create('guestViewInternal').generate();
 var ExtensionViewImpl = require('extensionView').ExtensionViewImpl;
 var ExtensionViewConstants =
@@ skipping 19 matching lines @@
 };
 
 // Sets the attribute's value.
 ExtensionViewAttribute.prototype.setValue = function(value) {
   this.extensionViewImpl.element.setAttribute(this.name, value || '');
 };
 
 // Changes the attribute's value without triggering its mutation handler.
 ExtensionViewAttribute.prototype.setValueIgnoreMutation = function(value) {
   this.ignoreMutation = true;
-  this.extensionViewImpl.element.setAttribute(this.name, value || '');
+  this.setValue(value);
   this.ignoreMutation = false;
 }
 
 // Defines this attribute as a property on the extensionview node.
 ExtensionViewAttribute.prototype.defineProperty = function() {
   Object.defineProperty(this.extensionViewImpl.element, this.name, {
     get: function() {
       return this.getValue();
     }.bind(this),
     set: function(value) {
@@ skipping 22 matching lines @@
   ExtensionViewAttribute.call(this, ExtensionViewConstants.ATTRIBUTE_SRC,
                               extensionViewImpl);
   this.setupMutationObserver();
   this.beforeFirstNavigation = true;
 }
 
 SrcAttribute.prototype.__proto__ = ExtensionViewAttribute.prototype;
 
 SrcAttribute.prototype.setValueIgnoreMutation = function(value) {
   this.observer.takeRecords();
-  this.ignoreMutation = true;
-  this.extensionViewImpl.element.setAttribute(this.name, value || '');
-  this.ignoreMutation = false;
+  ExtensionViewAttribute.prototype.setValueIgnoreMutation.call(this, value);
 }
 
 SrcAttribute.prototype.handleMutation = function(oldValue, newValue) {
   if (!newValue && oldValue) {
     this.setValueIgnoreMutation(oldValue);
     return;
   }
   this.parse();
 };
 
@@ skipping 38 matching lines @@
 };
 
 // -----------------------------------------------------------------------------
 
 // Sets up all of the extensionview attributes.
 ExtensionViewImpl.prototype.setupExtensionViewAttributes = function() {
   this.attributes = {};
   this.attributes[ExtensionViewConstants.ATTRIBUTE_SRC] =
       new SrcAttribute(this);
 };