Shouldn't crash, but making it work is a different story. rdar://problem/18731910
The same crash can occur if the user deletes a file after a Blob is created.
Created attachment 252197 [details] proposed fix
Comment on attachment 252197 [details] proposed fix r=me
Comment on attachment 252197 [details] proposed fix Clearing flags on attachment: 252197 Committed r183736: <http://trac.webkit.org/changeset/183736>
All reviewed patches have been landed. Closing bug.