additional path on windows fixes

pkg/polymer/test/css_test.dart

 // Copyright (c) 2013, 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 css_test;
 
 import 'package:path/path.dart' as path;
 import 'package:polymer/src/messages.dart';
 import 'package:polymer/src/utils.dart' as utils;
 import 'package:unittest/compact_vm_config.dart';
@@ skipping 535 matching lines @@
     });
 
     tearDown(() {
       utils.path = new path.Builder();
     });
 
     test('test_simple_var', test_simple_var);
     test('test_var', test_var);
     test('test_simple_import', test_simple_import);
     test('test_imports', test_imports);
-    test('test_component_var', test_component_var);
+    group('test_component_var', test_component_var);
     test('test_pseudo_element', test_pseudo_element);
   });
 }