Site Settings Desktop: Polish the Site Data details dialog.

chrome/browser/resources/settings/site_settings/cookie_tree_node.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,
  *            title: string,
  *            totalUsage: string,
  *            type: string}}
@@ skipping 155 matching lines @@
         var id = siteEntry.data_.id;
         var description = '';
 
         for (var j = 0; j < siteEntry.children_.length; ++j) {
           var descriptionNode = siteEntry.children_[j];
           if (j > 0)
             description += ', ';
 
           // Some types, like quota, have no description nodes.
           var dataType = '';
-          if (descriptionNode.data_.type != undefined)
+          if (descriptionNode.data_.type != undefined) {
             dataType = descriptionNode.data_.type;
-          else
-            dataType = descriptionNode.children_[0].data_.type;
+          } else {
+            // A description node might not have children when it's deleted.
+            if (descriptionNode.children_.length > 0)
+              dataType = descriptionNode.children_[0].data_.type;
+          }
 
           var count =
               (dataType == 'cookie') ? descriptionNode.children_.length : 0;
           if (count > 1) {
             description += loadTimeData.getStringF('cookiePlural', count);
           } else {
             description += getCookieDataCategoryText(
                 dataType, descriptionNode.data_.totalUsage);
           }
 
@@ skipping 50 matching lines @@
           root.appendChild(content);
         }
       }
     },
   };
 
   return {
     CookieTreeNode: CookieTreeNode,
   };
 });