bool isBackForwardLoadType(FrameLoadType type)
{
    switch (type) {
        case FrameLoadTypeStandard:
        case FrameLoadTypeReload:
        case FrameLoadTypeReloadFromOrigin:
        case FrameLoadTypeSame:
        case FrameLoadTypeRedirectWithLockedBackForwardList:
        case FrameLoadTypeReplace:
            return false;
        case FrameLoadTypeBack:
        case FrameLoadTypeBackWMLDeckNotAccessible:
        case FrameLoadTypeForward:
        case FrameLoadTypeIndexedBackForward:
            return true;
    }
    ASSERT_NOT_REACHED();
    return false;
}

Unknown