Fix missing "..." in the supervised user import dialog.

chrome/browser/resources/options/supervised_user_list.js

 // Copyright 2014 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.supervisedUserOptions', function() {
   /** @const */ var List = cr.ui.List;
   /** @const */ var ListItem = cr.ui.ListItem;
   /** @const */ var ListSingleSelectionModel = cr.ui.ListSingleSelectionModel;
 
   /**
    * Create a new supervised user list item.
    * @param {Object} entry The supervised user this item represents.
    *     It has the following form:
    *       supervisedUser = {
    *         id: "Supervised User ID",
    *         name: "Supervised User Name",
    *         iconURL: "chrome://path/to/icon/image",
    *         onCurrentDevice: true or false,
    *         needAvatar: true or false
    *       }
    * @constructor
    * @extends {cr.ui.ListItem}
    */
   function SupervisedUserListItem(entry) {
     var el = cr.doc.createElement('div');
+    el.className = 'list-item';
     el.supervisedUser_ = entry;
     el.__proto__ = SupervisedUserListItem.prototype;
     el.decorate();
     return el;
   }
 
   SupervisedUserListItem.prototype = {
     __proto__: ListItem.prototype,
 
     /**
@@ skipping 74 matching lines @@
       this.selectionModel = new ListSingleSelectionModel();
       this.autoExpands = true;
     },
   };
 
   return {
     SupervisedUserListItem: SupervisedUserListItem,
     SupervisedUserList: SupervisedUserList,
   };
 });