Apply content-security-policy to the HTML options page. This is a

chrome/browser/resources/shared/js/options/deletable_item_list.js

 // Copyright (c) 2011 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 151 matching lines @@
      */
     deleteItemAtIndex: function(index) {
     },
   };
 
   return {
     DeletableItemList: DeletableItemList,
     DeletableItem: DeletableItem,
   };
 });