Fix padding on Add Supervised User button

chrome/browser/resources/chromeos/login/header_bar.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. */
 
 #login-header-bar {
   -webkit-padding-start: 15px;
   bottom: 0;
   left: 0;
   padding-bottom: 6px;
   position: absolute;
@@ skipping 54 matching lines @@
 #more-settings-header-bar-item.active button.add-supervised-user-menu {
   background-color: white;
   border: 1px solid lightgray;
   border-radius: 2px;
   bottom: 0;
   color: black !important;
   display: block;
   font-size: 13px;
   height: auto;
   min-height: 34px;
+  padding: 0 16px;
   position: absolute;
   text-align: center;
-  width: 180px;
+  white-space: nowrap;
 }
 
 #more-settings-header-bar-item.active button.add-supervised-user-menu:focus {
   border: 2px solid var(--google-blue-500);
   border-radius: 2px;
+  padding: 0 15px;
 }
 
 html[dir=rtl] .header-bar-item {
   background-position: right center;
 }
 
 #login-header-bar #shutdown-button-text,
 #login-header-bar #restart-button-text,
 #login-header-bar #add-user-button-text,
 #login-header-bar #guest-user-button-text,
@@ skipping 64 matching lines @@
   background-image: -webkit-image-set(
       url(images/1x/signout.svg) 1x,
       url(images/2x/signout.svg) 2x );
 }
 
 .button-restricted {
   border: 1px solid transparent;
   color: white !important;
   opacity: 0.4 !important;
 }