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

chrome/browser/resources/extensions/extensions.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. */
 
 html.loading * {
   -webkit-transition-duration: 0 !important;
 }
 
 html:not(.focus-outline-visible)
 :enabled:focus:-webkit-any(input[type='checkbox'], input[type='radio']) {
@@ skipping 212 matching lines @@
 }
 
 .corrupt-install-message {
   color: rgb(196, 42, 23);
 }
 
 .action-links {
   margin-bottom: 0.5em;
 }
 
-.action-links :-webkit-any(a, .link-button) {
+.action-links a {
   -webkit-margin-end: 1em;
   -webkit-margin-start: 0;
 }
 
 .extension-details {
   -webkit-box-flex: 1;
   -webkit-padding-end: 7px;
   -webkit-padding-start: 55px;
 }
 
 .extension-description,
 .extension-version,
 .extension-list-item-wrapper.inactive-extension .extension-details,
 .location-text,
 .blacklist-text,
 .enable-checkbox input:disabled + .enable-checkbox-text {
   color: rgb(151, 156, 160);
 }
 
 .enable-controls {
   /* Matches right: position of dev controls toggle. */
   -webkit-margin-end: 20px;
   position: relative;
 }
 
-/* We use x.link-button here so that we get higher specifity than the
- * link-button rules without resorting to the Dark Side (!IMPORTANT). */
-.terminated-reload-link.link-button,
-.corrupted-repair-button.link-button {
+/* We use x[is='action-link'] here so that we get higher specifity than the
+ * action link rules without resorting to the Dark Side (!IMPORTANT). */
+.terminated-reload-link[is='action-link'],
+.corrupted-repair-button[is='action-link'] {
   /* Matches width of trash. */
   -webkit-margin-end: 30px;
 }
 
 .checkbox {
   display: inline-block;
 }
 
 .enabled-text {
   font-weight: bold;
@@ skipping 135 matching lines @@
 /* Sideload Wipeout */
 
 .sideload-wipeout-learn-more {
   text-decoration: none;
 }
 
 .sideload-wipeout-banner .page-banner-text {
   -webkit-padding-start: 8px;
   background-image: none;
 }