[gtk+] Fix GtkStatusbarAccessible

[Matthias Clasen <matthiasc src gnome org>]

commit 9da057568c59a9a57d26c7718535f4e92062c56b
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Oct 18 17:20:14 2017 +0200

    Fix GtkStatusbarAccessible
    
    GtkStatusbar is no longer a container, so GtkStatusbarAccessible
    can no longer be a container accessible.

 gtk/a11y/gtkstatusbaraccessible.c |    9 +--------
 1 files changed, 1 insertions(+), 8 deletions(-)
---
diff --git a/gtk/a11y/gtkstatusbaraccessible.c b/gtk/a11y/gtkstatusbaraccessible.c
index 7d84a5a..d21fc72 100644
--- a/gtk/a11y/gtkstatusbaraccessible.c
+++ b/gtk/a11y/gtkstatusbaraccessible.c
@@ -22,7 +22,7 @@
 #include "gtkstatusbaraccessible.h"
 
 
-G_DEFINE_TYPE (GtkStatusbarAccessible, gtk_statusbar_accessible, GTK_TYPE_CONTAINER_ACCESSIBLE)
+G_DEFINE_TYPE (GtkStatusbarAccessible, gtk_statusbar_accessible, GTK_TYPE_WIDGET_ACCESSIBLE)
 
 static void
 text_changed (GtkStatusbar *statusbar,
@@ -128,18 +128,11 @@ static void
 gtk_statusbar_accessible_class_init (GtkStatusbarAccessibleClass *klass)
 {
   AtkObjectClass  *class = ATK_OBJECT_CLASS (klass);
-  GtkContainerAccessibleClass *container_class = (GtkContainerAccessibleClass*)klass;
 
   class->get_name = gtk_statusbar_accessible_get_name;
   class->get_n_children = gtk_statusbar_accessible_get_n_children;
   class->ref_child = gtk_statusbar_accessible_ref_child;
   class->initialize = gtk_statusbar_accessible_initialize;
-  /*
-   * As we report the statusbar as having no children
-   * we are not interested in add and remove signals
-   */
-  container_class->add_gtk = NULL;
-  container_class->remove_gtk = NULL;
 }
 
 static void