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

chrome/browser/resources/options/password_manager_list.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.passwordManager', function() {
   const ArrayDataModel = cr.ui.ArrayDataModel;
   const DeletableItemList = options.DeletableItemList;
   const DeletableItem = options.DeletableItem;
   const List = cr.ui.List;
 
@@ skipping 42 matching lines @@
       var passwordInput = this.ownerDocument.createElement('input');
       passwordInput.type = 'password';
       passwordInput.className = 'inactive-password';
       passwordInput.readOnly = true;
       passwordInput.value = showPasswords ? this.password : '********';
       passwordInputDiv.appendChild(passwordInput);
 
       // The show/hide button.
       if (showPasswords) {
         var button = this.ownerDocument.createElement('button');
-        button.classList.add('hidden');
+        button.hidden = true;
         button.classList.add('password-button');
         button.textContent = localStrings.getString('passwordShowButton');
         button.addEventListener('click', this.onClick_, true);
         passwordInputDiv.appendChild(button);
       }
 
       this.contentElement.appendChild(passwordInputDiv);
     },
 
     /** @inheritDoc */
     selectionChanged: function() {
       var passwordInput = this.querySelector('input[type=password]');
       var textInput = this.querySelector('input[type=text]');
       var input = passwordInput || textInput;
       var button = input.nextSibling;
       // |button| doesn't exist when passwords can't be shown.
       if (!button)
         return;
       if (this.selected) {
         input.classList.remove('inactive-password');
-        button.classList.remove('hidden');
+        button.hidden = false;
       } else {
         input.classList.add('inactive-password');
-        button.classList.add('hidden');
+        button.hidden = true;
       }
     },
 
     /**
      * On-click event handler. Swaps the type of the input field from password
      * to text and back.
      * @private
      */
     onClick_: function(event) {
       // The password is the input element previous to the button.
@@ skipping 168 matching lines @@
     },
   };
 
   return {
     PasswordListItem: PasswordListItem,
     PasswordExceptionsListItem: PasswordExceptionsListItem,
     PasswordsList: PasswordsList,
     PasswordExceptionsList: PasswordExceptionsList,
   };
 });