[mutter] Revert "screen: Set a black background for testing purposes"

[Ray Strode <halfline src gnome org>]

commit 7ecde19aeebd84515862a8719ff6ec6e42099ca8
Author: Ray Strode <rstrode redhat com>
Date:   Thu Nov 20 14:40:19 2014 -0500

    Revert "screen: Set a black background for testing purposes"
    
    This reverts commit ec8ed1dbb04ce8169c0a38ddf066d5565117c587.
    
    1) It turns out to add a momentary flicker from the transition
    between the login screen and user session
    2) It actually isn't needed anymore since bug 733026
    
    https://bugzilla.gnome.org/show_bug.cgi?id=740377

 src/core/screen.c |   10 ----------
 1 files changed, 0 insertions(+), 10 deletions(-)
---
diff --git a/src/core/screen.c b/src/core/screen.c
index dbf3f60..b26137e 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -496,15 +496,6 @@ create_guard_window (Display *xdisplay, MetaScreen *screen)
   return guard_window;
 }
 
-/* Set a black background on the root window so that we don't
- * see confusing old copies of old windows when debugging
- * and testing. */
-static void
-meta_screen_set_background (MetaScreen *screen)
-{
-  XSetWindowBackground (screen->display->xdisplay, screen->xroot, 0x00000000);
-}
-
 MetaScreen*
 meta_screen_new (MetaDisplay *display,
                  int          number,
@@ -709,7 +700,6 @@ meta_screen_new (MetaDisplay *display,
   reload_monitor_infos (screen);
 
   meta_screen_set_cursor (screen, META_CURSOR_DEFAULT);
-  meta_screen_set_background (screen);
 
   /* Handle creating a no_focus_window for this screen */
   screen->no_focus_window =