Converted Observatory cpu-profile element

runtime/observatory/tests/observatory_ui/nav/menu-item/element_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
+
 import 'dart:html';
 import 'package:unittest/unittest.dart';
 import 'package:observatory/src/elements/nav/menu_item.dart';
 
 main() {
   NavMenuItemElement.tag.ensureRegistration();
 
   group('instantiation', () {
     final label = 'custom-label';
     final link = 'link-to-target';
@@ skipping 47 matching lines @@
       expect(e.shadowRoot.innerHtml.contains(link2), isFalse);
       e.link = link2;
       await e.onRendered.first;
       expect(e.shadowRoot.innerHtml.contains(link1), isFalse);
       expect(e.shadowRoot.innerHtml.contains(link2), isTrue);
       e.remove();
       await e.onRendered.first;
     });
   });
 }