aChange all asyncTest/callbackDone style tests to use the new expectAsync/

tests/isolate/v2_compute_this_script_browser_test.dart

Index: tests/isolate/v2_compute_this_script_browser_test.dart
===================================================================
--- tests/isolate/v2_compute_this_script_browser_test.dart	(revision 7823)
+++ tests/isolate/v2_compute_this_script_browser_test.dart	(working copy)
@@ -21,13 +21,12 @@
   useDomConfiguration();
   var script = document.createElement('script');
   document.body.appendChild(script);
-  asyncTest('spawn with other script tags in page', 1, () {
+  test('spawn with other script tags in page', () {
     ReceivePort port = new ReceivePort();
-    port.receive((msg, _) {
+    port.receive(expectAsync2((msg, _) {
       expect(msg).equals('re: hi');
       port.close();
-      callbackDone();
-    });
+    }));
 
     SendPort s = spawnFunction(child);
     s.send('hi', port.toSendPort());