* Using addUpdate() makes sure purges are coalesced and
de-duplicated.
* Also removed incosistent $wgUseSquid checks. If CDN caching
is not used, then $wgSquidServers will just be empty anyway.
Bug: T119016
Change-Id: I8b448366f037f668385d252f9d68289b71d1a707
I244a66fe19c089df4bcabcf745536d99b2103bc4 splitted RevisionDelete.php in
11 files, but that removed code formatting and produced long lines.
Restored code formatting and added newline at end of files.
Change-Id: I51ab4181b723b46a806dad4752420e6bfc530133