provide all blocked URLs").
SpamBlacklist extension to provide all matched URLs to
spamPageWithContent() rather than just one. Performance
hit negligible and zero for all edits that don't hit the
SpamBlacklist (99.999%+).
DEPENDENT ON OTHER HALF OF FIX (now in core):
https://gerrit.wikimedia.org/r/3740
Change-Id: Ia951d5795c5cedb6c3876be89f8a08f110004102