Remove some unused RenderElement API, instead attachRendererInternal/detachRendererInternal are used.
Created attachment 459497 [details] Patch
Unable to find any modified ChangeLog in Attachment 459497 [details]
Committed r294329 (250649@main): <https://commits.webkit.org/250649@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 459497 [details].
<rdar://problem/93436896>