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

ui/file_manager/file_manager/foreground/css/list.css

 /* Copyright 2013 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. */
 
 /* Derived from /ui/webui/resources/css/list.css. */
 
 list,
 grid {
   display: block;
   outline: none;
@@ skipping 44 matching lines @@
 list :-webkit-any(
     input[type='input'],
     input[type='password'],
     input[type='search'],
     input[type='text'],
     input[type='url']),
 list :-webkit-any(
     button,
     input[type='button'],
     input[type='submit'],
-    select):not(.custom-appearance):not(.link-button) {
+    select):not(.custom-appearance) {
   line-height: normal;
   vertical-align: middle;
 }
 
 list > [hidden],
 grid > [hidden] {
   display: none;
 }