DOMUI Prefs: Fix close buttons

chrome/browser/resources/options/deletable_item_list.js

 // Copyright (c) 2010 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() {
   const List = cr.ui.List;
   const ListItem = cr.ui.ListItem;
 
   /**
    * Creates a deletable list item, which has a button that will trigger a call
@@ skipping 103 matching lines @@
     /**
      * Callback for onclick events.
      * @param {Event} e The click event object.
      * @private
      */
     handleClick_: function(e) {
       if (this.disabled)
         return;
 
       var target = e.target;
-      if (target.className == 'close-button') {
+      if (target.classList.contains('close-button')) {
         var listItem = this.getListItemAncestor(target);
         var selected = this.selectionModel.selectedIndexes;
 
         // Check if the list item that contains the close button being clicked
         // is not in the list of selected items. Only delete this item in that
         // case.
         var idx = this.getIndexOfListItem(listItem);
         if (selected.indexOf(idx) == -1) {
           this.deleteItemAtIndex(idx);
         } else {
@@ skipping 40 matching lines @@
      */
     deleteItemAtIndex: function(index) {
     },
   };
 
   return {
     DeletableItemList: DeletableItemList,
     DeletableItem: DeletableItem,
   };
 });