Update powerwash illustration

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

 /* Copyright 2017 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. */
 
 .bottom-buttons {
   width: 100%;
 }
 
 .reset-popup {
   background: white;
+  border-radius: 2px;
   box-shadow: 0 0 16px rgba(0, 0, 0, .12), 0 16px 16px rgba(0, 0, 0, .24);
   min-height: 158px;
   position: relative;
   width: 512px;
+  z-index: 10;
 }
 
 .reset-popup h1 {
-  -webkit-margin-after: 0;
-  -webkit-margin-before: 0;
   color: var(--google-grey-900);
   font: 15px Roboto, sans-serif;
+  margin-bottom: 0;
+  margin-top: 0;
   padding: 16px 20px;
 }
 
 .reset-popup-content-area {
   color: rgba(0, 0, 0, .54);
   font: 13px Roboto, sans-serif;
   line-height: 20px;
   padding: 0 20px 20.5px;
 }
 
 oobe-text-button {
   -webkit-margin-end: 16px;
-  -webkit-margin-after: 16px;
   color: #5a5a5a;
+  margin-bottom: 16px;
 }
 
 #cancelButton {
   -webkit-margin-end: 4px;
 }