Modified unittest to use new argument syntax.

tests/html/request_animation_frame_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.
 
 #library('RequestAnimationFrameTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
   useHtmlConfiguration();
 
   test('oneShot', () {
       var frame = window.requestAnimationFrame(
           expectAsync1((timestamp) { }));
     });
 
   test('twoShot', () {
       var frame = window.requestAnimationFrame(
           expectAsync1((timestamp1) {
             window.requestAnimationFrame(
                 expectAsync1((timestamp2) {
                     // Not monotonic on Safari and IE.
-                    // Expect.isTrue(timestamp2 > timestamp1, 'timestamps ordered');
+                    // expect(timestamp2, greaterThan(timestamp1),
+                    //    reason: 'timestamps ordered');
                   }));
           }));
     });
 
 
   // How do we test that a callback is never called?  We can't wrap the uncalled
   // callback with 'expectAsync1'.  Will request several frames and try
   // cancelling the one that is not the last.
   test('cancel1', () {
       var frame1 = window.requestAnimationFrame(
@@ skipping 10 matching lines @@
           expectAsync1((timestamp1) { }));
       var frame2 = window.requestAnimationFrame(
           (timestamp2) {
             throw new Exception('Should have been cancelled');
           });
       var frame3 = window.requestAnimationFrame(
           expectAsync1((timestamp3) { }));
       window.cancelAnimationFrame(frame2);
     });
 }