Remove unmaintained utils/testrunner

utils/testrunner/http_server_runner.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.
-
-library http_server_runner;
-import 'dart:io';
-import 'http_server.dart';
-
-main(List<String> arguments) {
-  var optionsParser = getOptionParser();
-  try {
-    var argResults = optionsParser.parse(arguments);
-    var server = new HttpTestServer(
-        int.parse(argResults['port']),
-        argResults['root']);
-  } catch (e) {
-    print(e);
-    print('Usage: http_server_runner.dart <options>');
-    print(optionsParser.getUsage());
-  }
-}