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

chrome/browser/resources/shared/js/options/import_data_overlay.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() {
   var OptionsPage = options.OptionsPage;
 
   /**
    * ImportDataOverlay class
    * Encapsulated handling of the 'Import Data' overlay page.
@@ skipping 165 matching lines @@
   ImportDataOverlay.dismiss = function() {
     ImportDataOverlay.setImportingState(false);
     OptionsPage.closeOverlay();
   };
 
   // Export
   return {
     ImportDataOverlay: ImportDataOverlay
   };
 });