Currently, we're logging some document layout information into the Plugins channel, which is probably not the right space for this kind of logging. Let's instead converge on a `PDF` channel.
<rdar://problem/122029724>
Pull request: https://github.com/WebKit/WebKit/pull/23613
Committed 273883@main (c7d77992d772): <https://commits.webkit.org/273883@main> Reviewed commits have been landed. Closing PR #23613 and removing active labels.