FileReader should not prevent entering the back/forward cache.
Created attachment 381216 [details] Patch
<rdar://problem/56381623>
Created attachment 381227 [details] Patch
Created attachment 381248 [details] Patch
Patch is ready for review.
Comment on attachment 381248 [details] Patch r=me
Comment on attachment 381248 [details] Patch Clearing flags on attachment: 381248 Committed r251327: <https://trac.webkit.org/changeset/251327>
All reviewed patches have been landed. Closing bug.