Update unittest to new package layout.

tests/html/datalistelement_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('datalistelement_dataview_test');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
+#import('../../pkg/unittest/lib/unittest.dart');
+#import('../../pkg/unittest/lib/html_config.dart');
 #import('dart:html');
 
 main() {
   useHtmlConfiguration();
 
   var div;
 
   setUp(() {
       div = new DivElement();
       document.body.nodes.add(div);
@@ skipping 29 matching lines @@
       var options = document.query('#browsers')
           .queryAll('option');  // Uses DataListElement.
       expect(options.length, 5);
   });
 
   test('create', () {
       var list = new DataListElement();
       expect(list is DataListElement);
     });
 }