Don't use external servers in the tests

tests/standalone/io/http_client_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.
-//
-// VMOptions=
-// VMOptions=--short_socket_read
-// VMOptions=--short_socket_write
-// VMOptions=--short_socket_read --short_socket_write
-
-import "dart:io";
-import "dart:uri";
-import "dart:isolate";
-
-void testGoogle() {
-  HttpClient client = new HttpClient();
-  client.get('www.google.com', 80, '/')
-      .then((request) => request.close())
-      .then((response) {
-        Expect.isTrue(response.statusCode < 500);
-        response.listen((data) {}, onDone: client.close);
-      })
-      .catchError((error) => Expect.fail("Unexpected IO error: $error"));
-}
-
-int testGoogleUrlCount = 0;
-void testGoogleUrl() {
-  HttpClient client = new HttpClient();
-
-  void testUrl(String url) {
-    var requestUri = Uri.parse(url);
-    client.getUrl(requestUri)
-        .then((request) => request.close())
-        .then((response) {
-          testGoogleUrlCount++;
-          Expect.isTrue(response.statusCode < 500);
-          if (requestUri.path.length == 0) {
-            Expect.isTrue(response.statusCode != 404);
-          }
-          response.listen((data) {}, onDone: () {
-            if (testGoogleUrlCount == 5) client.close();
-          });
-        })
-        .catchError((error) => Expect.fail("Unexpected IO error: $error"));
-  }
-
-  testUrl('http://www.google.com');
-  testUrl('http://www.google.com/abc');
-  testUrl('http://www.google.com/?abc');
-  testUrl('http://www.google.com/abc?abc');
-  testUrl('http://www.google.com/abc?abc#abc');
-}
-
-void testInvalidUrl() {
-  HttpClient client = new HttpClient();
-  Expect.throws(
-      () => client.getUrl(Uri.parse('ftp://www.google.com')));
-}
-
-void testBadHostName() {
-  HttpClient client = new HttpClient();
-  ReceivePort port = new ReceivePort();
-  client.get("some.bad.host.name.7654321", 0, "/")
-    .then((request) {
-      Expect.fail("Should not open a request on bad hostname");
-    }).catchError((error) {
-      port.close();  // We expect onError to be called, due to bad host name.
-    }, test: (error) => error is! String);
-}
-
-void main() {
-  testGoogle();
-  testGoogleUrl();
-  testInvalidUrl();
-  testBadHostName();
-}