Remove GraphicsLayer::supportsBackgroundColorContent GraphicsLayer::supportsBackgroundColorContent returns true for all ports. We can remove it.
Created attachment 460624 [details] Patch
Committed 252089@main (5bfb5940ad28): <https://commits.webkit.org/252089@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 460624 [details].
<rdar://problem/96331337>