Combine window.setTimeout/setInterval with Timer and Timer.repeating. Also

tests/html/cssstyledeclaration_test.dart

 // Copyright (c) 2011, 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.
 
 library CssStyleDeclarationTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
+import 'dart:async';
 
 main() {
   useHtmlConfiguration();
 
   createTestStyle() {
     return new CssStyleDeclaration.css("""
       color: blue;
       width: 2px !important;
     """);
   };
@@ skipping 58 matching lines @@
     // the original string. Just check that it's something other than null.
     expect(style.transform.length, greaterThan(3));
   });
 
   // IE9 requires an extra poke for some properties to get applied.
   test('IE9 Invalidation', () {
     var element = new DivElement();
     document.body.children.add(element);
 
     // Need to wait one tick after the element has been added to the page.
-    window.setTimeout(expectAsync0(() {
+    new Timer(const Duration(milliseconds: 10), expectAsync0(() {
       element.style.textDecoration = 'underline';
       var style = element.getComputedStyle();
       expect(style.textDecoration, equals('underline'));
-    }), 10);
+    }));
   });
 }