We should back port https://chromium.googlesource.com/chromium/blink/+/74399c27c8b93286bae03a1d6371735935b34d85.
Created attachment 200118 [details] Patch
Comment on attachment 200118 [details] Patch Clearing flags on attachment: 200118 Committed r149376: <http://trac.webkit.org/changeset/149376>
All reviewed patches have been landed. Closing bug.