md-settings: Fix back navigation from /resetProfileSettings.

chrome/test/data/webui/md_history/test_util.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.
 
-/*
- * Waits for queued up tasks to finish before proceeding. Inspired by:
- * https://github.com/Polymer/web-component-tester/blob/master/browser/environment/helpers.js#L97
- */
-function flush() {
-  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);
-  });
-}
-
 /**
  * Replace the current primary element of the test with a new element. Useful
  * as an alternative to PolymerTest.clearBody() which preserves styling.
  * @param {Element} element
  */
 function replaceBody(element) {
   var body = document.body;
   var currentBody =
       body.querySelector('history-app') || body.querySelector('.test-body');
   body.removeChild(currentBody);
@@ skipping 170 matching lines @@
   var tabs = tabUrls.map(function(tabUrl) {
     return {sessionId: 456, timestamp: 0, title: tabUrl, url: tabUrl};
   });
 
   return {
     tabs: tabs,
     sessionId: '123',
     userVisibleTimestamp: "A while ago"
   };
 }