so that we don't confuse it with Layout::LineBox (which is the spec line box)
Created attachment 408138 [details] Patch
Created attachment 408143 [details] Patch
Thanks Sam!
Committed r266685: <https://trac.webkit.org/changeset/266685> All reviewed patches have been landed. Closing bug and clearing flags on attachment 408143 [details].
<rdar://problem/68436952>