Revert of Add test for system tray network menu icon for extension-controlled networks

chrome/test/data/extensions/networking_config_delegate/background.js

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Register this extension as the network handler for wifi1.
-chrome.networking.config.setNetworkFilter([{Type: 'WiFi', SSID: 'wifi1'}],
-                                          function() {
-                                            chrome.test.sendMessage('done');
-                                          });