Fixed a11y tab handling on cookies settings

chrome/browser/resources/options/cookies_list.js

 // Copyright (c) 2012 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 */ var DeletableItemList = options.DeletableItemList;
   /** @const */ var DeletableItem = options.DeletableItem;
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
   /** @const */ var ListSingleSelectionModel = cr.ui.ListSingleSelectionModel;
 
@@ skipping 155 matching lines @@
 
     /** @type {boolean} */
     get expanded() {
       return this.expanded_;
     },
     set expanded(expanded) {
       if (this.expanded_ == expanded)
         return;
       this.expanded_ = expanded;
       if (expanded) {
+        this.classList.add('show-items');
         var oldExpanded = this.list.expandedItem;
         this.list.expandedItem = this;
         this.updateItems_();
         if (oldExpanded)
           oldExpanded.expanded = false;
-        this.classList.add('show-items');
       } else {
         if (this.list.expandedItem == this) {
           this.list.expandedItem = null;
         }
         this.style.height = '';
         this.itemsChild.style.height = '';
         this.classList.remove('show-items');
       }
     },
 
@@ skipping 336 matching lines @@
         default:
           text = loadTimeData.getString('cookie_' + this.data.type);
       }
       if (!text)
         return;
 
       var div = item.ownerDocument.createElement('div');
       div.className = 'cookie-item';
       // Help out screen readers and such: this is a clickable thing.
       div.setAttribute('role', 'button');
-      div.tabIndex = 0;
       div.textContent = text;
       var apps = this.data.appsProtectingThis;
       if (apps)
         apps.forEach(addAppInfo.bind(null, div));
 
       var index = item.appendItem(this, div);
       div.onclick = function() {
         item.selectedIndex = (item.selectedIndex == index) ? -1 : index;
       };
     },
@@ skipping 370 matching lines @@
       parent.clear();
       this.addByParent_(parent, 0, children);
       parent.endBatchUpdates();
     },
   };
 
   return {
     CookiesList: CookiesList
   };
 });