Merge the dart:uri library into dart:core and update the Uri class

utils/tests/testrunner/http_client_tests/http_client_test.dart

 // Copyright (c) 2013, 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 testrunner_test;
 
 import 'dart:async';
 import 'dart:io';
-import 'dart:uri';
 import 'package:unittest/unittest.dart';
 
 main() {
   var get = (String what, int code, String text) {
     var c = new Completer();
     HttpClient client = new HttpClient();
     client.getUrl(Uri.parse("http://127.0.0.1:3456/$what"))
     .then((HttpClientRequest request) {
       // Prepare the request then call close on it to send it.
       return request.close();
@@ skipping 13 matching lines @@
     return c.future;
   };
   test('test1', () {
     return get('test.txt', 200, "Hello world!\n");
   });
   test('test2', () {
     return get('fail.txt', 404, "");
   });
 }