Update utils to new library syntax.

utils/css/uitest.dart

Index: utils/css/uitest.dart
===================================================================
--- utils/css/uitest.dart	(revision 14646)
+++ utils/css/uitest.dart	(working copy)
@@ -2,9 +2,9 @@
 // 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.
 
-#import('dart:html');
-#import('css.dart');
-#import('../lib/file_system_memory.dart');
+import 'dart:html';
+import 'css.dart';
+import '../lib/file_system_memory.dart';
 
 void runCss([bool debug = false, bool parseOnly = false]) {
   final Document doc = window.document;