Surface the audited last usage time in a user readable string.

chrome/browser/resources/options/website_settings.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. */
 
 #website-settings-page {
   max-height: 445px;
   min-width: 540px;
 }
 
 .website-column-headers {
@@ skipping 19 matching lines @@
 }
 
 .content-area.website-list-content-area {
   display: flex;
   flex-direction: column;
 }
 
 /* Styles for the origin list elements in the website settings page. */
 #origin-list {
   border: 1px solid #d9d9d9;
+  font-family: Noto Sans;
+  font-size: 13px;
   margin: 5px 0 0;
   min-height: 287px;
 }
 
 #origin-list-item {
   height: 30px;
 }
 
+.local-storage-usage {
+  color: #7f7f7f;
+  margin: auto 0;
+}
+
 list.origin-list .favicon-cell {
   -webkit-margin-start: 6px;
   -webkit-padding-start: 21px;
-  font-family: Noto Sans;
-  font-size: 13px;
 }