C:\feikua\chromium\src\chrome\browser\ui\views\tabs\tab_drag_controller.cc

  if (tab_strip_changed) {
    is_dragging_new_browser_ = false;
    did_restore_window_ = false;
    //if (DragBrowserToNewTabStrip(target_context, point_in_screen) ==
    //    DRAG_BROWSER_RESULT_STOP) {
    //  return Liveness::ALIVE;
    //}
  }