IWebFrameLoadDelegatePrivate2 now exposes didClearWindowObjectForFrameInScriptWorld. This is a more specific isolated worlds version of didClearWindowObject. For clients that don't support didClearWindowObjectForFrameInScriptWorld, we should call didClearWindowObject instead.
Created attachment 44028 [details] Fall back if E_NOTIMPL returned
Comment on attachment 44028 [details] Fall back if E_NOTIMPL returned r=me
http://trac.webkit.org/changeset/51500