[gtk] grid: Use standard padding

[Matthias Clasen <matthiasc src gnome org>]

commit bf2ff5f582e6eb3002b7e651f896eeb30a9abf3a
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 26 23:30:21 2019 -0400

    grid: Use standard padding

 gtk/gtkgrid.h | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)
---
diff --git a/gtk/gtkgrid.h b/gtk/gtkgrid.h
index 2ac97cba4e..243e11c17a 100644
--- a/gtk/gtkgrid.h
+++ b/gtk/gtkgrid.h
@@ -56,14 +56,7 @@ struct _GtkGridClass
 
   /*< private >*/
 
-  void (*_gtk_reserved1) (void);
-  void (*_gtk_reserved2) (void);
-  void (*_gtk_reserved3) (void);
-  void (*_gtk_reserved4) (void);
-  void (*_gtk_reserved5) (void);
-  void (*_gtk_reserved6) (void);
-  void (*_gtk_reserved7) (void);
-  void (*_gtk_reserved8) (void);
+  gpointer padding[8];
 };
 
 GDK_AVAILABLE_IN_ALL