Update some more webui progress indicators to new throbber:

chrome/browser/resources/options/clear_browser_data_overlay.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. */
 
 #clear-browser-data-overlay {
   width: 500px;
 }
 
 #clear-data-checkboxes {
   -webkit-padding-start: 8px;
   margin: 5px 0;
 }
 
 #cbd-throbber {
-  margin: 4px 10px;
-  vertical-align: middle;
+  /* This should be changed to align-self: center; when the parent is changed to
+   * display: flex; */
+  position: relative;
+  top: 5px;
   visibility: hidden;
 }
 
 #flash-storage-settings {
   padding-top: 5px;
 }
 
 #clear-browser-data-info-banner {
   background-color: rgb(249, 237, 184);
   border: solid 1px rgb(237, 201, 103);
   border-radius: 2px;
   font-weight: bold;
   margin: 0 20px 11px 17px;
   padding: 6px 8px;
 }
 
 #some-stuff-remains-footer > p {
   margin: 0;
 }
 
 #some-stuff-remains-footer button {
   padding: 0;
 }