Send cache purges for action=raw after editing user css/js
These types of requests can be cached for a short time (~5 min) in
Squid/Varnish.
Change importScript to be consistent with importStylesheet in the query
parameter order (title, action, ctype).
We only send purges for the exact urls as used by importScript and
importStylesheet.
Note: ResourceLoader things have their cache handled separately and
aren't affected by this change.
Users like instant updating of scripts after having changed them.
Bug: 56874
Change-Id: Idaa8552cf371dbafeb8b730f35b3b5c4fc339fb0