Modified unittest to use new argument syntax.

tests/html/isolates_test.dart

 #library('IsolatesTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 #import('dart:json');
 #import('dart:isolate', prefix:'isolate');
 
 String responseFor(message) => 'response for $message';
 
 void isolateEntry() {
@@ skipping 21 matching lines @@
   test('IsolateSpawn', () {
     isolate.spawnFunction(isolateEntry);
   });
   test('NonDOMIsolates', () {
     var callback = expectAsync0((){});
     var port = isolate.spawnFunction(isolateEntry);
     final msg1 = 'foo';
     final msg2 = 'bar';
     port.call(msg1).then((response) {
       guardAsync(() {
-        Expect.equals(responseFor(msg1), response);
+        expect(response, equals(responseFor(msg1)));
         port.call(msg2).then((response) {
           guardAsync(() {
-            Expect.equals(responseFor(msg2), response);
+            expect(response, equals(responseFor(msg2)));
             callback();
           });
         });
       });
     });
   });
 }