Those 2 files appear at the top level of the WebCore project tree, when they should be in their respective folder.
I'll take this as a First Bug.
Created attachment 451952 [details] [fast-cq] Patch
Comment on attachment 451952 [details] [fast-cq] Patch Works great, thanks!
Committed r289778 (247246@main): <https://commits.webkit.org/247246@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 451952 [details].
<rdar://problem/88934003>