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

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

Index: runtime/observatory/tests/observatory_ui/nav/menu/element_test.dart
diff --git a/runtime/observatory/tests/observatory_ui/nav/menu/element_test.dart b/runtime/observatory/tests/observatory_ui/nav/menu/element_test.dart
index 2ff905959a833707a88022857440c384c5a84235..0cabc3cfabd9b09e8b3578854537de3e97cb9b7c 100644
--- a/runtime/observatory/tests/observatory_ui/nav/menu/element_test.dart
+++ b/runtime/observatory/tests/observatory_ui/nav/menu/element_test.dart
@@ -3,15 +3,11 @@
 // BSD-style license that can be found in the LICENSE file.
 import 'dart:html';
 import 'package:unittest/unittest.dart';
-import 'package:observatory/src/elements/helpers/rendering_queue.dart';
 import 'package:observatory/src/elements/nav/menu.dart';
 
 main() {
   NavMenuElement.tag.ensureRegistration();
 
-  final TimedRenderingBarrier barrier = new TimedRenderingBarrier();
-  final RenderingQueue queue = new RenderingQueue.fromBarrier(barrier);
-
   group('instantiation', () {
     final label = 'custom-label';
     test('label', () {
@@ -33,7 +29,7 @@ main() {
   group('elements', () {
     test('created', () async {
       final label = 'custom-label';
-      final NavMenuElement e = new NavMenuElement(label, queue: queue);
+      final NavMenuElement e = new NavMenuElement(label);
       document.body.append(e);
       await e.onRendered.first;
       expect(e.shadowRoot.children.length, isNonZero, reason: 'has elements');
@@ -46,7 +42,7 @@ main() {
     test('react to label change', () async {
       final label1 = 'custom-label-1';
       final label2 = 'custom-label-2';
-      final NavMenuElement e = new NavMenuElement(label1, queue: queue);
+      final NavMenuElement e = new NavMenuElement(label1);
       document.body.append(e);
       await e.onRendered.first;
       expect(e.shadowRoot.innerHtml.contains(label1), isTrue);
@@ -60,8 +56,7 @@ main() {
     });
     test('react to last change', () async {
       final label = 'custom-label';
-      final NavMenuElement e = new NavMenuElement(label, last: false,
-          queue: queue);
+      final NavMenuElement e = new NavMenuElement(label, last: false);
       document.body.append(e);
       await e.onRendered.first;
       expect(e.shadowRoot.innerHtml.contains('>'), isTrue);