[mutter] compositor: Remove unused code fetching _XSETROOT_ID

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

commit 66d37e06baf9029ddeb5e2be9ad3bc90be4af102
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Jan 8 14:18:56 2013 -0500

    compositor: Remove unused code fetching _XSETROOT_ID
    
    We don't use this atom anywhere, so don't bother fetching it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=691363

 src/compositor/compositor-private.h |    1 -
 src/compositor/compositor.c         |    4 +---
 2 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/src/compositor/compositor-private.h b/src/compositor/compositor-private.h
index e7eadf8..125ffbf 100644
--- a/src/compositor/compositor-private.h
+++ b/src/compositor/compositor-private.h
@@ -18,7 +18,6 @@ struct _MetaCompositor
   MetaDisplay    *display;
 
   Atom            atom_x_root_pixmap;
-  Atom            atom_x_set_root;
   Atom            atom_net_wm_window_opacity;
   guint           repaint_func_id;
 
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index 5bd14b8..105464f 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -1270,7 +1270,6 @@ meta_compositor_new (MetaDisplay *display)
 {
   char *atom_names[] = {
     "_XROOTPMAP_ID",
-    "_XSETROOT_ID",
     "_NET_WM_WINDOW_OPACITY",
   };
   Atom                   atoms[G_N_ELEMENTS(atom_names)];
@@ -1297,8 +1296,7 @@ meta_compositor_new (MetaDisplay *display)
                     compositor);
 
   compositor->atom_x_root_pixmap = atoms[0];
-  compositor->atom_x_set_root = atoms[1];
-  compositor->atom_net_wm_window_opacity = atoms[2];
+  compositor->atom_net_wm_window_opacity = atoms[1];
 
   compositor->repaint_func_id = clutter_threads_add_repaint_func (meta_repaint_func,
                                                                   compositor,