UI flow rework for device reset options. Reset made available from gaia screen. Tests adapted.

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

 /* Copyright 2013 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.
  *
  * This contains common styling for all the OOBE screens.
  */
 
 .step {
   box-sizing: border-box;
   position: absolute;
@@ skipping 125 matching lines @@
   right: 49px;
 }
 
 #oobe.autolaunch #autolaunch-confirm-button,
 #oobe.autolaunch #autolaunch-cancel-button,
 #oobe.connect #continue-button,
 #oobe.eula #accept-button,
 #oobe.eula #back-button,
 #oobe.kiosk-enable #kiosk-cancel-button,
 #oobe.kiosk-enable #kiosk-enable-button,
-#oobe.reset #reset-button,
-#oobe.reset #reset-cancel-button,
 #oobe.signin #signin-button,
 #oobe.user-image #ok-button {
   display: block;
 }
 
 #autolaunch-confirm-button,
 #back-button,
 #kiosk-enable-button,
 #reset-button,
 #password-changed-back-button,
@@ skipping 15 matching lines @@
 
 html[highlight=strong] #security-info a:focus,
 html[highlight=strong] #eula a:focus,
 html[highlight=strong] .step-extra-controls a:focus,
 html[highlight=strong] .menu-control:focus,
 html[highlight=strong] input[type='button']:focus,
 html[highlight=strong] button:focus {
   box-shadow: 0 0 23px rgb(77, 144, 254) !important;
 }