[Clean up] Fix style guide nits in chrome/browser/resources/options2.

chrome/browser/resources/options2/content_settings.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. */
 
 .exception-pattern {
   -webkit-box-flex: 1;
   -webkit-margin-end: 10px;
   -webkit-margin-start: 14px;
 }
 
@@ skipping 39 matching lines @@
 
 div[role='listitem'][managedby] {
   color: #666;
   font-style: italic;
   position: relative;
 }
 
 .settings-list div[role='listitem'][managedby='policy'],
 .settings-list div[role='listitem'][managedby='extension'] {
   background: -webkit-linear-gradient(rgb(250, 230, 146), rgb(250, 230, 146));
+  border-bottom: 1px solid rgb(201, 189, 141);
   border-top: 0;
-  border-bottom: 1px solid rgb(201, 189, 141);
 }
 
 list div[role='listitem'][managedby='policy'] .close-button {
   background-image: url('chrome://theme/IDR_MANAGED');
   opacity: 1;
 }
 
 list div[role='listitem'][managedby='extension'] .close-button {
   background-image: url('chrome://theme/IDR_EXTENSIONS_SECTION_SMALL');
   opacity: 1;
 }