Steps to reproduce:
disable experimental WebKit features (in about://flags/).
an exception should occur because the function should not exist.
the call is successful.
Created attachment 179559 [details]
Comment on attachment 179559 [details]
Clearing flags on attachment: 179559
Committed r137835: <http://trac.webkit.org/changeset/137835>
All reviewed patches have been landed. Closing bug.
Sorry for the delayed comment. Looks good to me too.