When we want to indicate that a parameter pack is unused, we should now use UNUSED_VARIADIC_PARAMS over UNUSED_FUNCTION. The former landed in 268692@main.
<rdar://problem/116273546>
Pull request: https://github.com/WebKit/WebKit/pull/18461
Committed 268721@main (adca80d36893): <https://commits.webkit.org/268721@main> Reviewed commits have been landed. Closing PR #18461 and removing active labels.