MD Settings; Lazy instantiate Clear Browsing Data dialog.

chrome/test/data/webui/settings/privacy_page_test.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.
 
 cr.define('settings_privacy_page', function() {
   /**
    * @constructor
    * @extends {TestBrowserProxy}
    * @implements {settings.PrivacyPageBrowserProxy}
    */
@@ skipping 80 matching lines @@
         testBrowserProxy = new TestClearBrowsingDataBrowserProxy();
         settings.ClearBrowsingDataBrowserProxyImpl.instance_ = testBrowserProxy;
         PolymerTest.clearBody();
         element = document.createElement('settings-clear-browsing-data-dialog');
         document.body.appendChild(element);
       });
 
       teardown(function() { element.remove(); });
 
       test('ClearBrowsingDataTap', function() {
-        element.open();
         assertTrue(element.$.dialog.opened);
 
         var cancelButton = element.$$('.cancel-button');
         assertTrue(!!cancelButton);
         var actionButton = element.$$('.action-button');
         assertTrue(!!actionButton);
         var spinner = element.$$('paper-spinner');
         assertTrue(!!spinner);
 
         assertFalse(cancelButton.disabled);
@@ skipping 29 matching lines @@
 
   return {
     registerTests: function() {
       if (cr.isMac || cr.isWin)
         registerNativeCertificateManagerTests();
 
       registerClearBrowsingDataTests();
     },
   };
 });