menuitem: Remove unused members

gtk/gtkmenuitem.c

@@ -740,7 +740,6 @@ gtk_menu_item_dispose (GObject *object)
   GtkMenuItem *menu_item = GTK_MENU_ITEM (object);
   GtkMenuItemPrivate *priv = menu_item->priv;
 
-  g_clear_object (&priv->motion_controller);
   g_clear_object (&priv->action_helper);
   g_clear_pointer (&priv->arrow_widget, gtk_widget_unparent);
 

gtk/gtkmenuitemprivate.h

@@ -40,11 +40,9 @@ struct _GtkMenuItemPrivate
   GtkActionHelper *action_helper;
 
   GtkWidget *arrow_widget;
-  GtkEventController *motion_controller;
 
   guint submenu_placement      : 1;
   guint submenu_direction      : 1;
-  guint right_justify          : 1;
   guint from_menubar           : 1;
   guint reserve_indicator      : 1;
 };