* Remove manual tracking of when a hash is first seen.
ResourceLoader is no longer time-based, rather it is content based.
Except where a timestamp is actually wanted as key, a hash is all
we need. The default implementation of simply calling getScript()
and hashing its output suffices, and isn't a performance problem
in this case.
* Also simplify getScript() by passing an object to 'mw.config.set'.
Instead of multiple calls for each key/value. This is a no-op
now because there is only one key.
* Fix inaccurate class comment that was copied from an unrelated
module in MediaWiki core.
Change-Id: I9bb82cadd9caa7e584e20dd49ce30b64218326c4
f06ac3efca