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

chrome/browser/resources/options/clear_browser_data_overlay.js

 // 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.
 
 cr.define('options', function() {
   var Page = cr.ui.pageManager.Page;
   var PageManager = cr.ui.pageManager.PageManager;
 
   /**
    * ClearBrowserDataOverlay class
@@ skipping 90 matching lines @@
       // {search engines} will not be cleared and may reflect your browsing
       // habits.". The following parses out the parts in brackts and braces and
       // converts them into buttons whereas the remainders are represented as
       // span elements.
       var footer =
           document.querySelector('#some-stuff-remains-footer p');
       var footerFragments =
           loadTimeData.getString('contentSettingsAndSearchEnginesRemain')
                       .split(/([|#])/);
       for (var i = 0; i < footerFragments.length;) {
-        var buttonId = '';
+        var linkId = '';
         if (i + 2 < footerFragments.length) {
           if (footerFragments[i] == '|' && footerFragments[i + 2] == '|') {
-            buttonId = 'open-content-settings-from-clear-browsing-data';
+            linkId = 'open-content-settings-from-clear-browsing-data';
           } else if (footerFragments[i] == '#' &&
                      footerFragments[i + 2] == '#') {
-            buttonId = 'open-search-engines-from-clear-browsing-data';
+            linkId = 'open-search-engines-from-clear-browsing-data';
           }
         }
 
-        if (buttonId != '') {
-          var button = document.createElement('button');
-          button.id = buttonId;
-          button.className = 'link-button';
-          button.textContent = footerFragments[i + 1];
-          footer.appendChild(button);
+        if (linkId) {
+          var link = document.createElement('a', 'action-link');
+          link.id = linkId;
+          link.textContent = footerFragments[i + 1];
+          footer.appendChild(link);
           i += 3;
         } else {
           var span = document.createElement('span');
           span.textContent = footerFragments[i];
           footer.appendChild(span);
           i += 1;
         }
       }
       $('open-content-settings-from-clear-browsing-data').onclick =
           function(event) {
@@ skipping 121 matching lines @@
     var topmostVisiblePage = PageManager.getTopmostVisiblePage();
     if (topmostVisiblePage && topmostVisiblePage.name == 'clearBrowserData')
       PageManager.closeOverlay();
   };
 
   // Export
   return {
     ClearBrowserDataOverlay: ClearBrowserDataOverlay
   };
 });