Migrate <cr-dialog> from PaperDialogBehavior to native <dialog>.

chrome/test/data/webui/settings/easy_unlock_browsertest_chromeos.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.
 
 /** @fileoverview Suite of tests for Easy Unlock within People section. */
 
 GEN_INCLUDE(['settings_page_browsertest.js']);
 
 /**
  * @constructor
@@ skipping 191 matching lines @@
         return browserProxy.whenCalled('startTurnOffFlow');
       }).then(function() {
         // To signal successful turnoff, the enabled status is broadcast
         // as false. At that point, the dialog should close and cancel
         // any in-progress turnoff flow. The cancellation should be
         // a no-op assuming the turnoff originated from this tab.
         cr.webUIListenerCallback('easy-unlock-enabled-status', false);
         return browserProxy.whenCalled('cancelTurnOffFlow');
       }).then(function() {
         Polymer.dom.flush();
-        expectFalse(turnOffDialog.$.dialog.opened);
+        expectFalse(turnOffDialog.$.dialog.open);
       });
     });
   });
 
   // Run all registered tests.
   mocha.run();
 });