Added Dartium support for JS to Dart PortSync calls

tests/html/js_interop_4_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('JsInterop4Test');
 #import('../../lib/unittest/unittest.dart');
 #import('../../lib/unittest/html_config.dart');
 #import('dart:html');
 #import('dart:isolate');
 
-const testData = const [1, '2', 'true'];
+final testData = const [1, '2', 'true'];
 
+// TODO(vsm): Convert all DOM isolate tests to the new syntax.
 class TestIsolate extends Isolate {
   TestIsolate() : super();
 
   void main() {
     var fun1 = window.lookupPort('fun1');
     var result = fun1.callSync(testData);
 
     var fun2 = window.lookupPort('fun2');
     fun2.callSync(result);
   }
 }
 
 main() {
   useHtmlConfiguration();
 
   // Test that our interop scheme also works from Dart to Dart.
   test('dart-to-dart-same-isolate', () {
     var fun = expectAsync1((message) {
-        Expect.listEquals(testData, message);
-        return message.length;
-      });
+      Expect.listEquals(testData, message);
+      return message.length;
+    });
 
     var port1 = new ReceivePortSync();
     port1.receive(fun);
     window.registerPort('fun', port1.toSendPort());
 
     var port2 = window.lookupPort('fun');
     var result = port2.callSync(testData);
     Expect.equals(3, result);
   });
 
   // Test across isolate boundary.
   test('dart-to-dart-cross-isolate', () {
-    var done = expectAsync0(() {});
-
     var fun1 = (message) {
       Expect.listEquals(testData, message);
       return message.length;
     };
 
     var port1 = new ReceivePortSync();
     port1.receive(fun1);
     window.registerPort('fun1', port1.toSendPort());
 
+    // TODO(vsm): Investigate why this needs to be called asynchronously.
+    var done = expectAsync0(() {});
     var fun2 = (message) {
       Expect.equals(3, message);
-
-      // TODO(vsm): Investigate why this needs to be called asynchronously.
       window.setTimeout(done, 0);
     };
 
     var port2 = new ReceivePortSync();
     port2.receive(fun2);
     window.registerPort('fun2', port2.toSendPort());
 
-    new TestIsolate().spawn().then((p) {});
+    new TestIsolate().spawn();
   });
 }