I'm going to disable error logging to fix regression (https://bugs.webkit.org/show_bug.cgi?id=113142) because correct logging requires grammar refactoring.
We might want consider importing: Restored error logging. https://src.chromium.org/viewvc/blink?view=rev&revision=149265
Created attachment 202970 [details] Patch
Comment on attachment 202970 [details] Patch Clearing flags on attachment: 202970 Committed r150791: <http://trac.webkit.org/changeset/150791>
All reviewed patches have been landed. Closing bug.