Add <a is="action-link">, a web component extension of <a> for in-page actions.

chrome/browser/resources/options/browser_options.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. */
 
 #change-home-page-section {
   margin-left: 30px;
 }
 
 #home-page-url {
   display: inline-block;
@@ skipping 117 matching lines @@
   white-space: nowrap;
 }
 
 .sync-error {
   background: rgb(255, 219, 219);
   border: 1px solid rgb(206, 76, 76);
   border-radius: 2px;
   padding: 10px;
 }
 
-.sync-error .link-button {
+.sync-error [is='action-link'] {
   margin: 0 1ex;
   padding: 0;
 }
 
 #mac-passwords-warning {
   margin-top: 10px;
 }
 
 input[type='range'] {
   vertical-align: middle;
@@ skipping 326 matching lines @@
 
 #about-button {
   margin-right: 30px;
 }
 
 /* An input that has no function except to take up the same amount of space as
  * a checkbox. */
 .spacer-checkbox {
   visibility: hidden;
 }