[mutter] window-actor: Remove left-over parent field

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

commit 7229a07b6ca1c7ba13566cc9c8c0e3601aa8233a
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Jun 27 15:06:16 2019 +0200

    window-actor: Remove left-over parent field
    
    The commit
    
    commit 60f7ff3a69255468974154d84fa5a06547314907
    Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
    Date:   Fri Dec 21 18:12:49 2018 -0200
    
        window-actor: Turn into a derivable class
    
    made the previous instance struct a instance private struct, but didn't
    remove the parent field. Since it's unused, there is no point in keeping
    it around, so lets drop it.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/658

 src/compositor/meta-window-actor.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 2588c74e4..1dda678da 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -51,8 +51,6 @@ typedef enum
 
 typedef struct _MetaWindowActorPrivate
 {
-  ClutterActor           parent;
-
   MetaWindow *window;
   MetaCompositor *compositor;