[mutter] display: Remove unused variable

[Jasper St. Pierre <jstpierre src gnome org>]

commit 2d2c47ba49206dc9a8ed5cc699e37b6432616f4e
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Jun 12 17:05:16 2014 -0400

    display: Remove unused variable

 src/core/display-private.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/core/display-private.h b/src/core/display-private.h
index 8dc4825..45e36ea 100644
--- a/src/core/display-private.h
+++ b/src/core/display-private.h
@@ -181,7 +181,6 @@ struct _MetaDisplay
   /* current window operation */
   MetaGrabOp  grab_op;
   MetaWindow *grab_window;
-  Window      grab_xwindow;
   int         grab_button;
   int         grab_anchor_root_x;
   int         grab_anchor_root_y;