video frame metadata was attached only for mock sources. And a few other drive-by and coding style cleanups.
Pull request: https://github.com/WebKit/WebKit/pull/8097
Committed 258662@main (4f70db078a9a): <https://commits.webkit.org/258662@main> Reviewed commits have been landed. Closing PR #8097 and removing active labels.
<rdar://problem/104027139>