fixes css tests, now they can also run in browsers too.

utils/tests/css/src/SelectorLiteralTest.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.
 
+#library("SelectorLiteralTest");
 #import("../../../css/css.dart");
 
 class SelectorLiteralTest {
   static final String ERROR = 'CompilerException: <buffer>:';
 
   static testMain() {
     initCssWorld();
     options.useColors = false;
 
     testSimpleClassSelectorSuccesses();
@@ skipping 217 matching lines @@
       Expect.equals("CssSelectorException: Use of Id selector must be " +
           "singleton starting at #_privateId2", e.toString());
     }
   }
 
 }
 
 main() {
   SelectorLiteralTest.testMain();
 }