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

chrome/browser/resources/options/about_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;
 
   /**
    * The number of milliseconds used for showing a message.
    * @type {number}
@@ skipping 36 matching lines @@
     // Initialize AboutPage.
     initializePage: function() {
       // Call base class implementation to start preference initialization.
       OptionsPage.prototype.initializePage.call(this);
 
       $('checkNow').onclick = function(event) {
         chrome.send('CheckNow');
       };
 
       $('moreInfoButton').onclick = function(event) {
-        $('aboutPageLessInfo').classList.add('hidden');
-        $('aboutPageMoreInfo').classList.remove('hidden');
+        $('aboutPageLessInfo').hidden = true;
+        $('aboutPageMoreInfo').hidden = false;
       };
 
       if (!AccountsOptions.currentUserIsOwner()) {
         $('channelSelect').disabled = true;
       } else {
         var self = this;
         $('channelSelect').onchange = function(event) {
           self.selectedOptionOnChange_(event.target.value);
         };
       }
@@ skipping 135 matching lines @@
   AboutPage.changeToRestartButton = function() {
     AboutPage.getInstance().changeToRestartButton_();
   };
 
   // Export
   return {
     AboutPage: AboutPage
   };
 
 });