Rework Timer interface.

tests/standalone/io/list_output_stream_test.dart

 // Copyright (c) 2012, 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:async';
 import 'dart:io';
 import 'dart:isolate';
 
 void testEmptyListOutputStream1() {
   ListOutputStream stream = new ListOutputStream();
@@ skipping 108 matching lines @@
 
   void onClosed() {
     Expect.equals(4, result.length);
     for (var i = 0; i < result.length; i++) Expect.equals(i + 1, result[i]);
     donePort.toSendPort().send(null);
   }
 
   stream.onData = onData;
   stream.onClosed = onClosed;
 
-  new Timer(0, (_) {
+  Timer.run(() {
     result.add(1);
     stream.write([2]);
 
-    new Timer(0, (_) {
+    Timer.run(() {
       result.add(3);
       stream.write([4]);
       stream.close();
     });
   });
 
   donePort.receive((x,y) => donePort.close());
 }
 
 void testListOutputStream5() {
@@ skipping 20 matching lines @@
 
 main() {
   testEmptyListOutputStream1();
   testEmptyListOutputStream2();
   testListOutputStream1();
   testListOutputStream2();
   testListOutputStream3();
   testListOutputStream4();
   testListOutputStream5();
 }