Delete old tests that aren't used and/or useful any more.

utils/tests/testrunner/http_client_tests/http_client_test.dart

-// Copyright (c) 2013, 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 testrunner_test;
-
-import 'dart:async';
-import 'dart:io';
-import 'package:unittest/unittest.dart';
-
-main() {
-  var get = (String what, int code, String text) {
-    var c = new Completer();
-    HttpClient client = new HttpClient();
-    client
-        .getUrl(Uri.parse("http://127.0.0.1:3456/$what"))
-        .then((HttpClientRequest request) {
-      // Prepare the request then call close on it to send it.
-      return request.close();
-    }).then((HttpClientResponse response) {
-      // Process the response.
-      expect(response.statusCode, code);
-      var sb = new StringBuffer();
-      response.transform(UTF8.decoder).listen((data) {
-        sb.write(data);
-      }, onDone: () {
-        expect(sb.toString(), text);
-        c.complete();
-      });
-    });
-    return c.future;
-  };
-  test('test1', () {
-    return get('test.txt', 200, "Hello world!\n");
-  });
-  test('test2', () {
-    return get('fail.txt', 404, "");
-  });
-}