[gtk+] testoffscreen: Remove deprecated calls

[Matthias Clasen <matthiasc src gnome org>]

commit 17d9e94682303bb9c2f3eb09a6d70a2497349c81
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jan 29 11:50:22 2016 -0500

    testoffscreen: Remove deprecated calls
    
    Not doing these calls doesn't seem to affect the demo,
    so lets just remove them.

 tests/gtkoffscreenbox.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/tests/gtkoffscreenbox.c b/tests/gtkoffscreenbox.c
index 29140a1..2fb20ef 100644
--- a/tests/gtkoffscreenbox.c
+++ b/tests/gtkoffscreenbox.c
@@ -346,9 +346,6 @@ gtk_offscreen_box_realize (GtkWidget *widget)
                    G_CALLBACK (offscreen_window_from_parent2), offscreen_box);
 
   context = gtk_widget_get_style_context (widget);
-  gtk_style_context_set_background (context, window);
-  gtk_style_context_set_background (context, offscreen_box->offscreen_window1);
-  gtk_style_context_set_background (context, offscreen_box->offscreen_window2);
 
   gdk_window_show (offscreen_box->offscreen_window1);
   gdk_window_show (offscreen_box->offscreen_window2);