Now, we stored some reference variables of WebCore as pointer variable at private data structure.
Created attachment 221085 [details] Patch
Comment on attachment 221085 [details] Patch Looks you need to rebase.
Created attachment 221091 [details] rebased
Comment on attachment 221091 [details] rebased LGTM
Comment on attachment 221091 [details] rebased Clearing flags on attachment: 221091 Committed r161933: <http://trac.webkit.org/changeset/161933>
All reviewed patches have been landed. Closing bug.