Clear() is not mandatory. However, to avoid misusing already disposed wrappers, Clear() should be always called just after Dispose().
Created attachment 172295 [details] Patch
Comment on attachment 172295 [details] Patch ok
Comment on attachment 172295 [details] Patch Clearing flags on attachment: 172295 Committed r133479: <http://trac.webkit.org/changeset/133479>
All reviewed patches have been landed. Closing bug.