MD Downloads: fix closure compilation issue

ui/webui/resources/cr_elements/cr_search_field/cr_search_field.js

 // Copyright 2015 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.
 
 /** @interface */
 var SearchFieldDelegate = function() {};
 
 SearchFieldDelegate.prototype = {
   /**
    * @param {string} value
@@ skipping 47 matching lines @@
       if (!this.showingSearch_)
         return;
 
       var searchInput = this.getSearchInput_();
       if (searchInput)
         searchInput.focus();
     });
   },
 
   /**
-   * @return {?HTMLElement}
+   * @return {?Element}
    * @private
    */
   getSearchInput_: function() {
     return this.$$('#search-input');
   },
 
   /** @private */
   onSearchTermSearch_: function() {
     if (this.delegate_)
       this.delegate_.onSearchTermSearch(this.getValue());
@@ skipping 18 matching lines @@
 
     searchInput.value = '';
     this.onSearchTermSearch_();
   },
 
   /** @private */
   toggleShowingSearch_: function() {
     this.showingSearch_ = !this.showingSearch_;
   },
 });