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

chrome/browser/resources/options/options_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() {
   /////////////////////////////////////////////////////////////////////////////
   // OptionsPage class:
 
   /**
    * Base class for options page.
@@ skipping 830 matching lines @@
 
     /**
      * Sets page visibility.
      */
     set visible(visible) {
       if ((this.visible && visible) || (!this.visible && !visible))
         return;
 
       this.setContainerVisibility_(visible);
       if (visible) {
-        this.pageDiv.classList.remove('hidden');
+        this.pageDiv.hidden = false;
 
         if (this.tab)
           this.tab.classList.add('navbar-item-selected');
       } else {
-        this.pageDiv.classList.add('hidden');
+        this.pageDiv.hidden = true;
 
         if (this.tab)
           this.tab.classList.remove('navbar-item-selected');
       }
 
       OptionsPage.updatePageFreezeStates();
 
       // A subpage was shown or hidden.
       if (!this.isOverlay && this.nestingLevel > 0) {
         OptionsPage.updateSubpageBackdrop_();
@@ skipping 131 matching lines @@
     shouldClose: function() {
       return true;
     },
   };
 
   // Export
   return {
     OptionsPage: OptionsPage
   };
 });