Otherwise the overlays will have a dangling pointer to the WebPage. We don't bother with webkit-thread overlays, since they are obsolete (and only used internally in WebKit, so they go down together with the WebPage anyway). PR 309160
Created attachment 193542 [details] Patch
Comment on attachment 193542 [details] Patch LGTM.
Comment on attachment 193542 [details] Patch Clearing flags on attachment: 193542 Committed r146058: <http://trac.webkit.org/changeset/146058>
All reviewed patches have been landed. Closing bug.