Bug 300226, unset window userdata before destroying

p=chpe@gnome.org
r=mpgritti@gnome.org sr=roc a=asa

widget/src/gtk2/mozdrawingarea.c

@@ -168,7 +168,9 @@ moz_drawingarea_finalize (GObject *object)
 
     drawingarea = MOZ_DRAWINGAREA(object);
 
+    gdk_window_set_user_data(drawingarea->inner_window, NULL);
     gdk_window_destroy(drawingarea->inner_window);
+    gdk_window_set_user_data(drawingarea->clip_window, NULL);
     gdk_window_destroy(drawingarea->clip_window);
 
     (* parent_class->finalize) (object);