Removes unneeded MobileContext::checkUserLoggedIn()

This appears to have been introduced a bagillion years ago (like
back in the days of SVN) and was related to ancient attempts to
implement mobile login. It is currently not used for anything,
so it and its invocation have been removed.

Change-Id: Ifd31b202ad08faba69399182f39bc0931e55efa9
Merge "Removes unneeded MobileContext::checkUserLoggedIn()"