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

tests/html/cssstyledeclaration_test.dart

Index: tests/html/cssstyledeclaration_test.dart
diff --git a/tests/html/cssstyledeclaration_test.dart b/tests/html/cssstyledeclaration_test.dart
index a0ef366835b86183c7f26b1c07b7c31e94b24bb5..1f8660532d9b262095424f1876efe0fbdef8c464 100644
--- a/tests/html/cssstyledeclaration_test.dart
+++ b/tests/html/cssstyledeclaration_test.dart
@@ -6,6 +6,7 @@ library CssStyleDeclarationTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
+import 'dart:async';
 
 main() {
   useHtmlConfiguration();
@@ -84,10 +85,10 @@ main() {
     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);
+    }));
   });
 }