Options: Remove the hidden class, since we override the hidden attribute to set

chrome/browser/resources/options/search_page.js

 // Copyright (c) 2011 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', function() {
   const OptionsPage = options.OptionsPage;
 
   /**
    * Encapsulated handling of a search bubble.
    * @constructor
@@ skipping 231 matching lines @@
             if (childDiv.tagName != 'SECTION')
               childDiv.classList.add('search-hidden');
           } else {
             childDiv.classList.remove('search-hidden');
           }
         }
 
         if (active) {
           // When search is active, remove the 'hidden' tag.  This tag may have
           // been added by the OptionsPage.
-          page.pageDiv.classList.remove('hidden');
+          page.pageDiv.hidden = false;
         }
       }
 
       if (active) {
         this.setSearchText_(this.searchField.value);
       } else {
         // After hiding all page content, remove any search results.
         this.unhighlightMatches_();
         this.removeSearchBubbles_();
       }
@@ skipping 286 matching lines @@
     // Trim beginning and ending whitespace.
     return text.replace(/^\s+|\s+$/g, '');
   };
 
   // Export
   return {
     SearchPage: SearchPage
   };
 
 });