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

tests/standalone/io/socket_exception_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.
 //
 // Tests socket exceptions.
 
 #import("dart:isolate");
 #import("dart:io");
 
 class SocketExceptionTest {
@@ skipping 165 matching lines @@
   static void unknownHostTest() {
     // Port to verify that the test completes.
     var port = new ReceivePort();
     port.receive((message, replyTo) => null);
 
     Socket s =  new Socket("hede.hule.hest", 1234);
     s.onError = (e) => port.close();
     s.onConnect = () => Expect.fail("Connection completed");
   }
 
-  static void unresponsiveHostTest() {
-    // Port to keep the VM alive until test completes.
-    var port = new ReceivePort();
-    port.receive((message, replyTo) => null);
-
-    Socket s =  new Socket("127.0.0.1", 65535);
-    s.onError = (e) => port.close();
-    s.onConnect = () => Expect.fail("Connection completed");
-  }
-
   static void testMain() {
     serverSocketExceptionTest();
     clientSocketExceptionTest();
     indexOutOfRangeExceptionTest();
     unknownHostTest();
-    // TODO(sgjesse): This test seems to fail on the buildbot.
-    //unresponsiveHostTest();
   }
 }
 
 main() {
   SocketExceptionTest.testMain();
 }
+