RenderLayerModelObject shouldn't need a willBeDestroyed() hook, since it has no need to call virtuals or walk the tree during destruction.
Created attachment 240859 [details] Patch
Comment on attachment 240859 [details] Patch Clearing flags on attachment: 240859 Committed r175475: <http://trac.webkit.org/changeset/175475>
All reviewed patches have been landed. Closing bug.