void RenderFlowThread::removeFlowChildInfo(RenderObject* child)
{
    if (child->isBox()) {
        removeRenderBoxRegionInfo(toRenderBox(child));
        if (child->canHaveRegionStyle())
            clearRenderBoxCustomStyle(toRenderBox(child));
    }
}
void RenderFlowThread::removeFlowChildInfo(RenderObject* child)
{
    if (child->isBox())
        removeRenderBoxRegionInfo(toRenderBox(child));
    clearRenderObjectCustomStyle(child);
}