MD Settings: Fix site data details regression and add test.

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

 // Copyright 2015 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.
 
 (function() {
   'use strict';
 
 /**
  * 'site-data-details-subpage' Display cookie contents.
  */
 Polymer({
   is: 'site-data-details-subpage',
 
   behaviors: [settings.RouteObserverBehavior, WebUIListenerBehavior],
 
   properties: {
     /**
      * The browser proxy used to retrieve and change cookies.
      * @type {settings.SiteSettingsPrefsBrowserProxy}
      */
     browserProxy: Object,
 
     /**
      * The cookie entries for the given site.
-     * @type {!Array<!CookieDataItem>}
+     * @type {!Array<!CookieDetails>}
      * @private
      */
     entries_: Array,
 
     /** Set the page title on the settings-subpage parent. */
     pageTitle: {
       type: String,
       notify: true,
     },
 
@@ skipping 40 matching lines @@
 
   /**
    * @return {!Array<!CookieDataForDisplay>}
    * @private
    */
   getCookieNodes_: function(node) {
     return getCookieData(node);
   },
 
   /**
-   * @param {!CookieDataSummaryItem} cookies
+   * @param {!CookieList} cookies
    * @private
    */
   onCookiesLoaded_: function(cookies) {
     this.siteId_ = cookies.id;
     this.entries_ = cookies.children;
     // Set up flag for expanding cookie details.
-    this.entries_.map(function(e) { return e.expanded_ = false; });
+    this.entries_.forEach(function(e) { e.expanded_ = false; });
   },
 
   /**
    * The site was not found. E.g. The site data may have been deleted or the
    * site URL parameter may be mistyped.
    * @private
    */
   onCookiesLoadFailed_: function() {
     this.siteId_ = '';
     this.entries_ = [];
@@ skipping 26 matching lines @@
 
   /**
    * A handler for when the user opts to remove all cookies.
    */
   removeAll: function() {
     this.browserProxy.removeCookie(this.siteId_);
   },
 });
 
 })();