Action sheets don’t work in presented view controllers.
Also mentioned on Twitter here:
Created attachment 279044 [details]
(In reply to comment #2)
> Created attachment 279044 [details]
> Patch v1
Only someone who knows UIKit (and WebKit2) should review this. My domain knowledge here is very weak.
Comment on attachment 279044 [details]
Clearing flags on attachment: 279044
Committed r200974: <http://trac.webkit.org/changeset/200974>
All reviewed patches have been landed. Closing bug.