Update library syntax and fix test status.

tests/utils/json_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('jsonTest');
+library jsonTest;
 
-#import('dart:json');
+import 'dart:json';
 
 main() {
   testEscaping();
   testParse();
   testParseInvalid();
 }
 
 void testParse() {
   // Scalars.
   Expect.equals(5, JSON.parse(' 5 '));
@@ skipping 152 matching lines @@
   Expect.stringEquals('"\\u001d"', JSON.stringify('\u001d'));
   Expect.stringEquals('"\\u001e"', JSON.stringify('\u001e'));
   Expect.stringEquals('"\\u001f"', JSON.stringify('\u001f'));
   Expect.stringEquals('"\\\""', JSON.stringify('"'));
   Expect.stringEquals('"\\\\"', JSON.stringify('\\'));
   Expect.stringEquals('"Got \\b, \\f, \\n, \\r, \\t, \\u0000, \\\\, and \\"."',
       JSON.stringify('Got \b, \f, \n, \r, \t, \u0000, \\, and ".'));
   Expect.stringEquals('"Got \\b\\f\\n\\r\\t\\u0000\\\\\\"."',
     JSON.stringify('Got \b\f\n\r\t\u0000\\".'));
 }