Bug1158625: If the user hasn't made their profile public, don't even show their pic and name
to logged-out users.

And in order to prevent enumeration attacks, show the same access denied screen to a
logged-out user, whether they hit the URL for an exising profile or whether they entered
an invalid URL.

Change-Id: Ic926fde3e04a59728868fffecc9272136fb83855