Update utils to new library syntax.

utils/css/uitest.dart

 // Copyright (c) 2011, 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.
 
-#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;
   final TextAreaElement classes = doc.query("#classes");
   final TextAreaElement expression = doc.query('#expression');
   final TableCellElement validity = doc.query('#validity');
   final TableCellElement result = doc.query('#result');
 
   List<String> knownWorld = classes.value.split("\n");
   List<String> knownClasses = [];
@@ skipping 164 matching lines @@
     runCss();
   });
 
   ButtonElement debugButton = window.document.query('#debug');
   debugButton.on.click.add((MouseEvent e) {
     runCss(true);
   });
 
   initCssWorld(false);
 }