Fix avatar image size in user pods on desktop

chrome/browser/resources/user_manager/user_manager.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.
  */
 
 /* Overrides for the desktop user manager screen. */
 
 .oobe-display {
   background-color: #eee;
 }
@@ skipping 40 matching lines @@
 
 html[dir=rtl] .user-image-pane {
   right: 0;
 }
 
 .pod .name {
   margin-top: 12px;
 }
 
 .pod .user-image {
-  max-height: 180px;
-  max-width: 180px;
-  opacity: 1;
+  height: 180px;
+  width: 180px;
 }
 
 .pod input[type='password'] {
   height: 45px;  /* 1px shorter as to not overlap the pod's rounded corners */
   top: 1px;
 }
 
 .pod.locked .locked-indicator {
   background-image: -webkit-image-set(
       url('chrome://theme/IDR_ICON_PROFILES_LOCKED') 1x,
@@ skipping 78 matching lines @@
   margin: 0;
   position: absolute;
   top: 9px;
   width: 0;
 }
 
 .action-box-button:hover,
 .action-box-area.active .action-box-button {
   border-top: 6px solid #4c4c4c;
 }