Fix the Declarative WebRequest API for <webview>

chrome/renderer/resources/extensions/web_view_experimental.js

 // Copyright 2013 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 experimental API for <webview>.
 // See web_view.js for details.
 //
 // <webview> Experimental API is only available on canary and dev channels of
 // Chrome.
 
@@ skipping 104 matching lines @@
 
 WebViewContextMenusImpl.prototype.update = function() {
   var args = $Array.concat([this.viewInstanceId_], $Array.slice(arguments));
   return $Function.apply(WebView.contextMenusUpdate, null, args);
 };
 
 var WebViewContextMenus = utils.expose(
     'WebViewContextMenus', WebViewContextMenusImpl,
     { functions: ['create', 'remove', 'removeAll', 'update'] });
 
-/**
- * @private
- */
-WebViewInternal.prototype.maybeAttachWebRequestEventToObject =
-    function(obj, eventName, webRequestEvent) {
-  Object.defineProperty(
-      obj,
-      eventName,
-      {
-        get: webRequestEvent,
-        enumerable: true
-      }
-  );
-};
-
 /** @private */
 WebViewInternal.prototype.maybeHandleContextMenu = function(e, webViewEvent) {
   var requestId = e.requestId;
   var self = this;
   // Construct the event.menu object.
   var actionTaken = false;
   var validateCall = function() {
     var ERROR_MSG_CONTEXT_MENU_ACTION_ALREADY_TAKEN = '<webview>: ' +
         'An action has already been taken for this "contextmenu" event.';
 
@@ skipping 147 matching lines @@
 
   // Expose <webview>.contextMenus object.
   Object.defineProperty(
       this.webviewNode,
       'contextMenus',
       {
         get: createContextMenus(),
         enumerable: true
       });
 };