ChromeOS: update alignment of user POD error bubble.

ui/login/bubble.css

 /* Copyright 2014 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.
  *
  * Css based bubble.
  */
 
 .bubble {
   -webkit-transition: opacity 200ms ease-in-out;
   background: rgba(0, 0, 0, 0.8);
   border-radius: 2px;
   color: rgba(255, 255, 255, 0.87);
   box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
   font-size: 12px;
   margin: 2px;
   max-width: 250px;
   padding: 16px;
   position: absolute;
 }
 
 .error-message-bubble {
   -webkit-padding-start: 30px;
   background: url(chrome://theme/IDR_WARNING) left top no-repeat;
   background-size: 24px;
 }
 
+.bubble[match-width] .error-message-bubble {
+  -webkit-padding-start: unset;
+  padding-top: 20px;
+}
+
 .error-message-bubble-padding {
   margin-bottom: 10px;
 }
 
 html[dir=rtl] .error-message-bubble {
   background-position: right top;
 }