[webkit-dev] Is it OK to remove Frame::setIsDisconnected() and isDisconnected() ?

Working on a change in FrameTree and noticed that the checks in top() and parent() for 'checkForDisconnectedFrame' rely on a flag in Frame that as far as I can tell is never set.So my naive question is: Can I remove the corresponding code from Frame and FrameTree? If not I would like if somebody could explain how they are used so I don't break anything with my change. More detail: * My search for calls to Frame::setIsDisconnected reveals no callers in WebKit, Chromium or Google code search. * This functionality is disjoint from Frame::disconnectOwnerElement(). Thanks, Sverrir