The LOG_ERROR in startLoading references 'resourceRequest', which has been WTF::Moved as part of a preceding function call. As such, the logging statement doesn't print out a possibly useful URL.
Created attachment 298511 [details] Patch
Comment on attachment 298511 [details] Patch Clearing flags on attachment: 298511 Committed r210562: <http://trac.webkit.org/changeset/210562>
All reviewed patches have been landed. Closing bug.