Typecheck JS files for chrome://history

ui/webui/resources/js/cr/ui/menu.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 MenuItem = cr.ui.MenuItem;
 
   /**
    * Creates a new menu element. Menu dispatches all commands on the element it
@@ skipping 68 matching lines @@
     },
 
     /**
      * Clears menu.
      */
     clear: function() {
       this.textContent = '';
     },
 
     /**
-     * Walks up the ancestors of |el| until a menu item belonging to this menu
+     * Walks up the ancestors of |node| until a menu item belonging to this menu
      * is found.
-     * @param {Element} el The element to start searching from.
+     * @param {Node} node The node to start searching from.
      * @return {cr.ui.MenuItem} The found menu item or null.
      * @private
      */
-    findMenuItem_: function(el) {
-      while (el && el.parentNode != this) {
-        el = el.parentNode;
+    findMenuItem_: function(node) {
+      while (node && node.parentNode != this) {
+        node = node.parentNode;
       }
-      return el ? assertInstanceof(el, MenuItem) : null;
+      return node ? assertInstanceof(node, MenuItem) : null;
     },
 
     /**
      * Handles mouseover events and selects the hovered item.
      * @param {Event} e The mouseover event.
      * @private
      */
     handleMouseOver_: function(e) {
-      var overItem = this.findMenuItem_(e.target);
+      var overItem = this.findMenuItem_(/** @type {Element} */(e.target));
       this.selectedItem = overItem;
     },
 
     /**
      * Handles mouseout events and deselects any selected item.
      * @param {Event} e The mouseout event.
      * @private
      */
     handleMouseOut_: function(e) {
       this.selectedItem = null;
@@ skipping 141 matching lines @@
       oldSelectedItem.selected = false;
       oldSelectedItem.blur();
     }
     var item = this.selectedItem;
     if (item)
       item.selected = true;
   }
 
   /**
    * The selected menu item.
-   * @type {number}
+   * type {number}
    */
   cr.defineProperty(Menu, 'selectedIndex', cr.PropertyKind.JS,
       selectedIndexChanged);
 
   // Export
   return {
     Menu: Menu
   };
 });