Remove offline_access permission

Prior to May 2012 a Login permission existed called offline_access.

This permission, when granted to your app, allowed access tokens to remain active without an expiry time. The permission was removed in a migration which was announced in early 2012 and enforced later that year.

For the current documentation explaining how to integrate Facebook Login in your App and how to use, extend, and debug access tokens, please refer to the current documentation.