Fix chrome://policy fall out from action-link change.

chrome/browser/resources/policy.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. */
 
 body.uber-frame {
   -webkit-margin-start: 23px;
 }
 
 body.uber-frame > .page {
   -webkit-margin-end: 0;
@@ skipping 130 matching lines @@
   font-weight: normal;
 }
 
 div.elide,
 span.value {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
-button.toggle-expanded-value {
+.toggle-expanded-value {
   padding: 0;
 }
 
 tbody.has-overflowed-value span.value {
   display: none;
 }
 
-tbody:not(.has-overflowed-value) button.toggle-expanded-value {
+tbody:not(.has-overflowed-value) .toggle-expanded-value {
   display: none;
 }
 
 tbody:not(.has-overflowed-value) > tr.expanded-value-container,
 tbody:not(.show-overflowed-value) > tr.expanded-value-container {
   display: none;
 }
 
 td.expanded-value {
   white-space: pre;
   word-wrap: break-word;
 }
 
 html:not(.focus-outline-visible)
 :enabled:focus:-webkit-any(input[type='checkbox'],
                            input[type='radio'], button) {
   /* Cancel border-color for :focus specified in widgets.css. */
   border-color: rgba(0, 0, 0, 0.25);
 }