Fix some ChromeVox Closure compiler errors.

chrome/browser/resources/chromeos/chromevox/common/aria_util.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.
 
 /**
  * @fileoverview A collection of JavaScript utilities used to simplify working
  * with ARIA (http://www.w3.org/TR/wai-aria).
  */
 
 
@@ skipping 575 matching lines @@
       result = result.concat(nextLevel);
     }
   }
   return result;
 };
 
 
 /**
  * Recursively finds the first node(s) that match the role.
  *
- * @param {Element} current The node to start looking at.
+ * @param {Node} current The node to start looking at.
  * @param {Array<string>} role The role(s) to match.
  * @return {Array<Element>} The array of matching nodes.
  */
 cvox.AriaUtil.getNextLevelItems = function(current, role) {
   if (current.nodeType != 1) { // If reached a node that is not an element.
     return [];
   }
   if (role.indexOf(cvox.AriaUtil.getRoleAttribute(current)) != -1) {
     return [current];
   } else {
@@ skipping 358 matching lines @@
  * @param {Node} node The node to be checked.
  * @return {boolean} Whether or not the node is an ARIA math node.
  */
 cvox.AriaUtil.isMath = function(node) {
   if (!node || !node.getAttribute) {
     return false;
   }
   var role = cvox.AriaUtil.getRoleAttribute(node);
   return role == 'math';
 };