Modified unittest to use new argument syntax.

tests/html/location_test.dart

 #library('LocationTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
   useHtmlConfiguration();
 
+  var isLocation = predicate((x) => x is Location, 'is a Location');
+
   test('location hash', () {
       final location = window.location;
-      Expect.isTrue(location is Location);
+      expect(location, isLocation);
 
       // The only navigation we dare try is hash.
       location.hash = 'hello';
       var h = location.hash;
-      Expect.equals('#hello', h);
+      expect(h, '#hello');
     });
 }