Revert "Use Timer and not AnimationFrame during Observatory UI tests"

runtime/observatory/tests/observatory_ui/nav/isolate-menu/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 'dart:async';
 import 'package:unittest/unittest.dart';
 import 'package:observatory/models.dart';
 import 'package:observatory/mocks.dart';
-import 'package:observatory/src/elements/helpers/rendering_queue.dart';
 import 'package:observatory/src/elements/nav/menu.dart';
 import 'package:observatory/src/elements/nav/isolate_menu.dart';
 
 main(){
   NavIsolateMenuElement.tag.ensureRegistration();
 
-  final TimedRenderingBarrier barrier = new TimedRenderingBarrier();
-  final RenderingQueue queue = new RenderingQueue.fromBarrier(barrier);
-
   final String tag = NavMenuElement.tag.name;
 
   StreamController<IsolateUpdateEvent> updatesController;
   final IsolateRefMock ref = const IsolateRefMock(id: 'i-id', name: 'old-name');
   final IsolateMock obj = const IsolateMock(id: 'i-id', name: 'new-name');
   setUp(() {
     updatesController = new StreamController<IsolateUpdateEvent>();
   });
   group('instantiation', () {
     test('IsolateRef', () {
       final NavIsolateMenuElement e = new NavIsolateMenuElement(ref,
                                       updatesController.stream);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.isolate, equals(ref));
     });
     test('Isolate', () {
       final NavIsolateMenuElement e = new NavIsolateMenuElement(obj,
                                       updatesController.stream);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.isolate, equals(obj));
     });
   });
   test('elements created after attachment', () async {
     final NavIsolateMenuElement e = new NavIsolateMenuElement(ref,
-        updatesController.stream, queue: queue);
+                                    updatesController.stream);
     document.body.append(e);
     await e.onRendered.first;
     expect(e.shadowRoot.children.length, isNonZero, reason: 'has elements');
     e.remove();
     await e.onRendered.first;
     expect(e.shadowRoot.children.length, isZero, reason: 'is empty');
   });
   group('updates', () {
     test('are correctly listen', () async {
       final NavIsolateMenuElement e = new NavIsolateMenuElement(ref,
-          updatesController.stream, queue: queue);
+                                      updatesController.stream);
       expect(updatesController.hasListener, isFalse);
       document.body.append(e);
       await e.onRendered.first;
       expect(updatesController.hasListener, isTrue);
       e.remove();
       await e.onRendered.first;
       expect(updatesController.hasListener, isFalse);
     });
     test('have effects', () async {
       final NavIsolateMenuElement e = new NavIsolateMenuElement(ref,
-          updatesController.stream, queue: queue);
+                                      updatesController.stream);
       document.body.append(e);
       await e.onRendered.first;
       expect((e.shadowRoot.querySelector(tag) as NavMenuElement)
              .label.contains(ref.name), isTrue);
       updatesController.add(new IsolateUpdateEventMock(isolate: obj));
       await e.onRendered.first;
       expect((e.shadowRoot.querySelector(tag) as NavMenuElement)
              .label.contains(ref.name), isFalse);
       expect((e.shadowRoot.querySelector(tag) as NavMenuElement)
             .label.contains(obj.name), isTrue);
       e.remove();
-      await e.onRendered.first;
     });
   });
 }