Updated mediawiki/extensions
Project: mediawiki/extensions/SpamBlacklist  a3defb8b9179c432ead598e3b21f3cc636984399

(bug 51621) Make SBL aware of ContentHandler.

This changes SpamBlacklist to make use of the new, ContentHandler
aware hooks.

This change also includes some refactoring and cleanup which made
the migration to the new hooks easier.

Change-Id: I21e9cc8479f2b95fb53c502f6e279c8a1ea378a5