Reapply remove setTimeout, take 3.

tests/html/window_open_test.dart

Index: tests/html/window_open_test.dart
diff --git a/tests/html/window_open_test.dart b/tests/html/window_open_test.dart
index 8fbe664ba32c837decf73cbf6d3a6049fa7f8427..23baef4603a7822357de0b07056a1696c4283e0b 100644
--- a/tests/html/window_open_test.dart
+++ b/tests/html/window_open_test.dart
@@ -2,6 +2,7 @@ library WindowOpenTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
+import 'dart:async';
 
 main() {
   useHtmlConfiguration();
@@ -26,8 +27,8 @@ closeWindow(win) {
   win.close();
   doneHandler() {
     if (!win.closed) {
-      window.setTimeout(expectAsync0(doneHandler), 1);
+      new Timer(const Duration(milliseconds: 1), expectAsync0(doneHandler));
     }
   }
-  window.setTimeout(expectAsync0(doneHandler), 1);
+  new Timer(const Duration(milliseconds: 1), expectAsync0(doneHandler));
 }