WebUI: Undo some usages of ES6 features that break uglify.

chrome/browser/resources/settings/site_settings/cookie_info.js

 // Copyright 2016 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.
 
 /**
  * @typedef {{hasChildren: boolean,
  *            id: string,
  *            idPath: string,
  *            title: string,
  *            totalUsage: string,
@@ skipping 57 matching lines @@
 
 /**
  * Get cookie data for a given HTML node.
  * @param {CookieDetails} data The contents of the cookie.
  * @return {!Array<CookieDataForDisplay>}
  */
 var getCookieData = function(data) {
   /** @type {!Array<CookieDataForDisplay>} */
   var out = [];
   var fields = cookieInfo[data.type];
-  for (var field of fields) {
+  for (var i = 0; i < fields.length; i++) {
+    var field = fields[0];
     // Iterate through the keys found in |cookieInfo| for the given |type|
     // and see if those keys are present in the data. If so, display them
     // (in the order determined by |cookieInfo|).
     var key = field[0];
     if (data[key].length > 0) {
       var entry = /** @type {CookieDataForDisplay} */({
         label: loadTimeData.getString(field[1]),
         content: data[key],
       });
       out.push(entry);
     }
   }
   return out;
 };