Include HTTP library in the standalone VM

tests/standalone/src/UrlEncodingTest.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("url_encoding_test");
-#import("../../../../chat/http.dart");
+#import("dart:io");
 
 void testParseEncodedString() {
   String encodedString = 'foo+bar%20foobar%25%26';
   Expect.equals(HttpUtil.decodeUrlEncodedString(encodedString),
                 'foo bar foobar%&');
 }
 
 void testParseQueryString() {
   // The query string includes escaped "?"s, "&"s, "%"s and "="s.
   // These should not affect the splitting of the string.
   String queryString = '%3F=%3D&foo=bar&%26=%25';
   Map<String, String> map = HttpUtil.splitQueryString(queryString);
   for (String key in map.getKeys()) {
     Expect.equals(map[key], { '&'   : '%',
                               'foo' : 'bar',
                               '?'   : '='}[key]);
   }
   Expect.setEquals(map.getKeys(), ['&', '?', 'foo']);
 }
 
 void main() {
   testParseEncodedString();
   testParseQueryString();
 }