Resync web-platform-tests/FileAPI tests from upstream.
Created attachment 414500 [details] Patch
Created attachment 414514 [details] Patch
Comment on attachment 414514 [details] Patch rs=me
Committed r270010: <https://trac.webkit.org/changeset/270010> All reviewed patches have been landed. Closing bug and clearing flags on attachment 414514 [details].
<rdar://problem/71568516>