[gtk+/toplevel-embedding] Fixed error in last commit (build break).

[Tristan Van Berkom <tvb src gnome org>]

commit 652d4148cf3190eef88119e476915f26e255e995
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Thu Dec 23 19:01:18 2010 +0900

    Fixed error in last commit (build break).

 gtk/gtkwidget.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 3993fdc..441eefe 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -8629,8 +8629,7 @@ gtk_widget_get_default_style (void)
   return gtk_default_style;
 }
 
-#if 0
-/* #ifdef G_ENABLE_DEBUG */
+#ifdef G_ENABLE_DEBUG
 
 /* Verify invariants, see docs/widget_system.txt for notes on much of
  * this.  Invariants may be temporarily broken while we're in the