Don't use external servers in the tests

tests/standalone/io/http_client_socket_reuse_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.
-
-import "dart:async";
-import "dart:io";
-import "dart:uri";
-import "dart:isolate";
-
-// By running tests sequentially, we cover the socket reuse code in HttpClient.
-
-void testGoogleUrls() {
-  int testsStarted = 0;
-  int testsFinished = 0;
-  bool allStarted = false;
-  HttpClient client = new HttpClient();
-
-  Future testUrl(String url) {
-    testsStarted++;
-    var requestUri = Uri.parse(url);
-    return client.getUrl(requestUri)
-        .then((HttpClientRequest request) => request.close())
-        .then((HttpClientResponse response) {
-          Expect.isTrue(response.statusCode < 500);
-          if (requestUri.path.length == 0) {
-            Expect.isTrue(response.statusCode != 404);
-          }
-          return response.reduce(null, (previous, element) => null);
-        })
-        .catchError((error) => Expect.fail("Unexpected IO error: $error"));
-  }
-
-  // TODO(3593): Use a Dart HTTP server for this test.
-  testUrl('http://www.google.dk')
-    .then((_) => testUrl('http://www.google.dk'))
-    .then((_) => testUrl('http://www.google.dk/#q=foo'))
-    .then((_) => testUrl('http://www.google.dk/#hl=da&q=foo'))
-    .then((_) { client.close(); });
-}
-
-void main() {
-  testGoogleUrls();
-}