[mutter] clutter/stage: Remove unused paint_data/notify fields

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 3f068d1138a9b6bc65da68c397f6263858712d69
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Apr 3 18:59:35 2020 +0200

    clutter/stage: Remove unused paint_data/notify fields
    
    It's usage was removed in ec911dc8b96a6cceac2a6582679528f2d599cb32 back
    in 2014. Lets get rid of the left over fields.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1175

 clutter/clutter/clutter-stage.c | 6 ------
 1 file changed, 6 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index 18fac8ed6..0b364638f 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -140,9 +140,6 @@ struct _ClutterStagePrivate
 
   ClutterStageState current_state;
 
-  gpointer paint_data;
-  GDestroyNotify paint_notify;
-
   int update_freeze_count;
 
   guint redraw_pending         : 1;
@@ -1959,9 +1956,6 @@ clutter_stage_finalize (GObject *object)
   if (priv->fps_timer != NULL)
     g_timer_destroy (priv->fps_timer);
 
-  if (priv->paint_notify != NULL)
-    priv->paint_notify (priv->paint_data);
-
   G_OBJECT_CLASS (clutter_stage_parent_class)->finalize (object);
 }