Adopt FALLBACK_PLATFORM
Created attachment 415332 [details] Patch
<rdar://problem/71949005>
Note that there are important steps to take when updating ANGLE. See https://trac.webkit.org/wiki/UpdatingANGLE
Created attachment 415337 [details] Patch
Committed r270420: <https://trac.webkit.org/changeset/270420> All reviewed patches have been landed. Closing bug and clearing flags on attachment 415337 [details].