Reenable http client tests and remove test that relies on a specific port on localhost.

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.
 
 #import("dart:io");
 #import("dart:uri");
 #import("dart:isolate");
 
 void testGoogle() {
   HttpClient client = new HttpClient();
@@ skipping 57 matching lines @@
   connection.onRequest = (HttpClientRequest request) {
     Expect.fail("Should not open a request on bad hostname");
   };
   ReceivePort port = new ReceivePort();
   connection.onError = (Exception error) {
     port.close();  // We expect onError to be called, due to bad host name.
   };
 }
 
 void main() {
-  // TODO(sgjesse): Making empty www.google.com requests seems to fail
-  //on buildbot.
-  //testGoogle();
-  //testGoogleUrl();
+  testGoogle();
+  testGoogleUrl();
   testInvalidUrl();
   testBadHostName();
 }