Remove keyIdentifier usage in chrome/browser/resources/*

chrome/browser/resources/options/chromeos/accounts_user_name_edit.js

 // Copyright (c) 2012 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.accounts', function() {
   /**
    * Email alias only, assuming it's a gmail address.
    *   e.g. 'john'
    *        {name: 'john', email: 'john@gmail.com'}
    * @const
@@ skipping 90 matching lines @@
 
       return null;
     },
 
     /**
      * Handler for key down event.
      * @private
      * @param {Event} e The keydown event object.
      */
     handleKeyDown_: function(e) {
-      if (e.keyIdentifier == 'Enter') {
+      if (e.key == 'Enter') {
         var user = this.parse(this.value);
         if (user) {
           var event = new Event('add');
           event.user = user;
           this.dispatchEvent(event);
         }
         this.select();
         // Avoid double-handling so the dialog doesn't close.
         e.stopPropagation();
       }
     }
   };
 
   return {
     UserNameEdit: UserNameEdit
   };
 });