Move CSS classes from ExceptionCode to Exception
Created attachment 291732 [details] Patch
Uploaded a version to see if the GTK bindings are broken (I imagine they are).
Created attachment 291748 [details] Patch
Created attachment 291749 [details] Patch
Created attachment 291750 [details] Patch
EWS all green. Ready for review.
Committed r207396: <http://trac.webkit.org/changeset/207396>