Trying to run vulture (https://pypi.org/project/vulture/) against webkitpy shows many classes are unused; we should just outright get rid of these.
<rdar://problem/119213702>
Pull request: https://github.com/WebKit/WebKit/pull/21356
Committed 271579@main (4a1b3a0d95c4): <https://commits.webkit.org/271579@main> Reviewed commits have been landed. Closing PR #21356 and removing active labels.