[mutter] clutter/stage: Remove sync_delay

[Marge Bot <marge-bot src gnome org>]

commit 33d91937cf40bd3113ea3292dc074eb35c7ba2db
Author: Ivan Molodetskikh <yalterz gmail com>
Date:   Tue Nov 24 21:43:49 2020 +0300

    clutter/stage: Remove sync_delay
    
    It is not accessed anywhere.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1707>

 clutter/clutter/clutter-stage.c | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index 7e8d655fda..1cdf5e6f59 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -128,8 +128,6 @@ struct _ClutterStagePrivate
   GSList *pending_relayouts;
   GHashTable *pending_queue_redraws;
 
-  gint sync_delay;
-
   int update_freeze_count;
 
   gboolean needs_update_devices;
@@ -1599,7 +1597,6 @@ clutter_stage_init (ClutterStage *self)
 
   priv->throttle_motion_events = TRUE;
   priv->min_size_changed = FALSE;
-  priv->sync_delay = -1;
   priv->motion_events_enabled = TRUE;
 
   priv->pointer_devices =