Compile chrome://settings, part 2: reduce from 950 to 400 errors

ui/webui/resources/js/cr/ui/autocomplete_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('cr.ui', function() {
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
   /** @const */ var List = cr.ui.List;
   /** @const */ var ListItem = cr.ui.ListItem;
 
   /**
@@ skipping 198 matching lines @@
     syncWidthAndPositionToInput: function() {
       var input = this.targetInput_;
       if (input) {
         this.style.width = input.getBoundingClientRect().width + 'px';
         cr.ui.positionPopupAroundElement(input, this, cr.ui.AnchorType.BELOW);
       }
     },
 
     /**
      * syncWidthAndPositionToInput function bound to |this|.
-     * @type {Function}
+     * @type {!Function|undefined}
      * @private
      */
     boundSyncWidthAndPositionToInput_: undefined,
 
     /**
      * @return {HTMLElement} The text field the autocomplete popup is currently
      *     attached to, if any.
      */
     get targetInput() {
       return this.targetInput_;
@@ skipping 34 matching lines @@
         event.preventDefault();
         event.stopPropagation();
       }
     },
   };
 
   return {
     AutocompleteList: AutocompleteList
   };
 });