Update Timer API to take the callback as the last parameter.

client/testing/unittest/unittest_vm.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 /**
  * A simple unit test library for running tests on the VM.
  */
 #library('unittest');
 
 #import('dart:io');
 #source('shared.dart');
 
 _platformInitialize() {
   // Do nothing.
 }
 
 _platformDefer(void callback()) {
-  new Timer((timer) {
+  new Timer(0, (timer) {
     callback();
-  }, 0);
+  });
 }
 
 _platformStartTests() {
   // Do nothing.
 }
 
 _platformCompleteTests(int testsPassed, int testsFailed, int testsErrors) {
   // Print each test's result.
   for (final test in _tests) {
     print('${test.result.toUpperCase()}: ${test.description}');
@@ skipping 14 matching lines @@
   } else if (testsFailed == 0 && testsErrors == 0) {
     print('All $testsPassed tests passed.');
     success = true;
   } else {
     print('$testsPassed PASSED, $testsFailed FAILED, $testsErrors ERRORS');
   }
 
   // A non-zero exit code is used by the test infrastructure to detect failure.
   if (!success) exit(1);
 }