The commit queue failed to commit all of the patch for bug# 42071. See http://trac.webkit.org/changeset/63944 and the follow-up http://trac.webkit.org/changeset/63945.
Yup. Looks like it. I'll dig up the logs. I suspect this is an svn-apply bug, possibly related to the new-ish property code.
*** This bug has been marked as a duplicate of bug 43981 ***