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

chrome/browser/resources/hotword_audio_verification/style.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. */
 
 * {
   box-sizing: border-box;
   color: rgba(0, 0, 0, .87);
   font-family: Helvetica, sans-serif;
   font-size: 14px;
   margin: 0;
@@ skipping 91 matching lines @@
   line-height: 100%;
   margin-top: 27px;
 }
 
 .col-spacing {
   float: left;
   height: 160px;
   width: 16px;
 }
 
-a.link-button {
+a[is='action-link'] {
   display: inline-block;
   font-size: 14px;
   margin-top: 22px;
   text-decoration: none;
   text-transform: uppercase;
 }
 
 div.buttonbar {
   background: rgba(0, 0, 0, .06);
   height: 60px;
@@ skipping 97 matching lines @@
   width: 24px;
 }
 
 .check .text {
   color: rgba(0, 0, 0, .54);
   display: inline-block;
   height: 24px;
   line-height: 24px;
   vertical-align: top;
 }