[gtk+] Make GtkOffscreenWindow use GtkStyleContext

[Carlos Garnacho <carlosg src gnome org>]

commit f9a5c14ac0c4077c1dc15145050b4554611cd03c
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jan 4 02:41:04 2011 +0100

    Make GtkOffscreenWindow use GtkStyleContext

 gtk/gtkoffscreenwindow.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkoffscreenwindow.c b/gtk/gtkoffscreenwindow.c
index ffa0e51..306c318 100644
--- a/gtk/gtkoffscreenwindow.c
+++ b/gtk/gtkoffscreenwindow.c
@@ -193,9 +193,8 @@ gtk_offscreen_window_realize (GtkWidget *widget)
   if (child)
     gtk_widget_set_parent_window (child, window);
 
-  gtk_widget_style_attach (widget);
-  gtk_style_set_background (gtk_widget_get_style (widget),
-                            window, GTK_STATE_NORMAL);
+  gtk_style_context_set_background (gtk_widget_get_style_context (widget),
+                                    window);
 }
 
 static void