Vulcanize MD History to improve page-load performance

chrome/browser/resources/md_history/app.js

 // Copyright 2016 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.
 
 Polymer({
   is: 'history-app',
 
   properties: {
     showSidebarFooter: Boolean,
 
@@ skipping 254 matching lines @@
   /**
    * This computed binding is needed to make the iron-pages selector update when
    * the synced-device-manager is instantiated for the first time. Otherwise the
    * fallback selection will continue to be used after the corresponding item is
    * added as a child of iron-pages.
    * @param {string} selectedPage
    * @param {Array} items
    * @return {string}
    * @private
    */
-  getSelectedPage_(selectedPage, items) {
+  getSelectedPage_: function(selectedPage, items) {
     return selectedPage;
   },
 
   /** @private */
   closeDrawer_: function() {
     var drawer = this.$$('#drawer');
     if (drawer)
       drawer.close();
   },
 });