WebUI: Replace vulcanize with polymer-bundler

chrome/test/data/webui/polymer_browser_test_base.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.
 
 /**
  * @fileoverview Framework for running JavaScript tests of Polymer elements.
  */
 
 /**
  * Test fixture for Polymer element testing.
@@ skipping 140 matching lines @@
   document.head.appendChild(script);
   return promise;
 };
 
 /**
  * Removes all content from the body. In a vulcanized build, this retains the
  * inlined tags so stylesheets and dom-modules are not discarded.
  */
 PolymerTest.clearBody = function() {
   // Save the div where vulcanize inlines content before clearing the page.
-  var vulcanizeDiv = document.querySelector('body > div[hidden][by-vulcanize]');
+  var vulcanizeDiv = document.querySelector(
+      'body > div[hidden][by-polymer-bundler]');
   document.body.innerHTML = '';
   if (vulcanizeDiv)
     document.body.appendChild(vulcanizeDiv);
 };
 
 /**
  * Helper function to return the list of extra libraries relative to basePath.
  */
 PolymerTest.getLibraries = function(basePath) {
   // Ensure basePath ends in '/'.
@@ skipping 10 matching lines @@
  * https://github.com/Polymer/web-component-tester/blob/master/browser/environment/helpers.js#L97
  */
 PolymerTest.flushTasks = function() {
   Polymer.dom.flush();
   // Promises have microtask timing, so we use setTimeout to explicity force a
   // new task.
   return new Promise(function(resolve, reject) {
     window.setTimeout(resolve, 0);
   });
 };