SpecialUndelete: Check permissions on a per-page basis

This will allow for hooks related to Title::userCan to
grant or revoke permissions based on the specific page
or namespace.

Bug: 14801
Change-Id: I02d8eb91cc5daff6e70b0dea3d2f58ed5fbfcf81
Merge "SpecialUndelete: Check permissions on a per-page basis"