Modified unittest to use new argument syntax.

tests/html/js_interop_2_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('JsInterop2Test');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 #import('dart:isolate');
 
@@ skipping 16 matching lines @@
 """;
 
 main() {
   useHtmlConfiguration();
 
   test('dart-to-js-ports', () {
     injectSource(isolateTest);
 
     SendPortSync port = window.lookupPort('test');
     var result = port.callSync('sent');
-    Expect.equals('received', result);
+    expect(result, 'received');
 
     result = port.callSync('ignore');
-    Expect.isNull(result);
+    expect(result, isNull);
   });
 }