void PaintLayerScrollableArea::ScrollbarManager::SetHasVerticalScrollbar(
    bool has_scrollbar) {
  if (has_scrollbar) {
    DisableCompositingQueryAsserts disabler;
    if (!v_bar_) {
      v_bar_ = CreateScrollbar(kVerticalScrollbar);
      v_bar_is_attached_ = 1;
      if (!v_bar_->IsCustomScrollbar())
        ScrollableArea()->DidAddScrollbar(*v_bar_, kVerticalScrollbar);
    } else {
      v_bar_is_attached_ = 1;
    }
  } else {
    v_bar_is_attached_ = 0;
    if (!DelayScrollOffsetClampScope::ClampingIsDelayed())
      DestroyScrollbar(kVerticalScrollbar);
  }
}

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.