Added shortcut for NW config screen in kiosk.

chrome/browser/resources/chromeos/login/screen_error_message.css

 /* Copyright (c) 2012 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.
  */
 
 #error-message {
   width: 650px;
 }
 
 .show-with-ui-state-update,
 .show-with-ui-state-signin,
 .show-with-ui-state-locally-managed,
 .show-with-ui-state-kiosk-mode,
 .show-with-ui-state-local-state-error,
 .show-with-ui-state-auto-enrollment-error,
 .show-with-error-state-portal,
 .show-with-error-state-offline,
 .show-with-error-state-proxy,
 .show-with-error-state-auth-ext-timeout,
+.show-with-error-state-kiosk-online,
 .guest-signin,
 .offline-login,
 .connecting-indicator {
   display: none;
 }
 
 .ui-state-update .show-with-ui-state-update,
 .ui-state-signin .show-with-ui-state-signin,
 .ui-state-locally-managed .show-with-ui-state-locally-managed,
 .ui-state-kiosk-mode .show-with-ui-state-kiosk-mode,
 .ui-state-local-state-error .show-with-ui-state-local-state-error,
 .ui-state-auto-enrollment-error .show-with-ui-state-auto-enrollment-error,
 .error-state-portal .show-with-error-state-portal,
 .error-state-offline .show-with-error-state-offline,
 .error-state-proxy .show-with-error-state-proxy,
 .error-state-auth-ext-timeout .show-with-error-state-auth-ext-timeout,
+.error-state-kiosk-online .show-with-error-state-kiosk-online,
 .allow-guest-signin .guest-signin,
 .allow-offline-login .offline-login,
 .show-connecting-indicator .connecting-indicator {
   display: block;
 }
 
 #oobe.error-message #step-logo {
   z-index: 1;
 }
 
@@ skipping 81 matching lines @@
   -webkit-animation: connecting-indicator-ellipsis 3s 0 infinite;
 }
 
 #connecting-indicator-ellipsis-2 {
   -webkit-animation: connecting-indicator-ellipsis 3s 500ms infinite;
 }
 
 #connecting-indicator-ellipsis-3 {
   -webkit-animation: connecting-indicator-ellipsis 3s 1s infinite;
 }