CodeGeneratorGObject.pm does not support custom attributes. We can skip generating code for attributes with [Custom]. The change would make sense since CodeGeneratorGObject.pm already skips attributes with [CustomGetter] or [CustomSetter].
Created attachment 125961 [details] Patch
Comment on attachment 125961 [details] Patch Clearing flags on attachment: 125961 Committed r107034: <http://trac.webkit.org/changeset/107034>
All reviewed patches have been landed. Closing bug.