Remove RenderObject::documentTimeline()
Created attachment 451074 [details] Patch
Note to reviewers: the bots will be red until the last of the bugs this depends on, bug 236224, is in the tree.
Committed r289215 (246900@main): <https://commits.webkit.org/246900@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 451074 [details].
<rdar://problem/88569770>