Attempt to fix 14485.

chrome/browser/gtk/gtk_floating_container.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/gtk/gtk_floating_container.h"
 
 #include <gtk/gtk.h>
 #include <gtk/gtkprivate.h>
 #include <gtk/gtkmarshal.h>
 
@@ skipping 154 matching lines @@
     }
 
     g_return_if_fail(removed_child);
   }
 }
 
 static void gtk_floating_container_forall(GtkContainer* container,
                                           gboolean include_internals,
                                           GtkCallback callback,
                                           gpointer callback_data) {
-  GtkBin *bin = GTK_BIN(container);
-
+  g_return_if_fail(container != NULL);
   g_return_if_fail(callback != NULL);
 
-  if (bin->child)
-    (*callback)(bin->child, callback_data);
+  // Let GtkBin do its part of the forall.
+  ((GTK_CONTAINER_CLASS(gtk_floating_container_parent_class))->forall)
+      (container, include_internals, callback, callback_data);
 
   GtkFloatingContainer* floating = GTK_FLOATING_CONTAINER(container);
   GList* children = floating->floating_children;
   while (children) {
     GtkFloatingContainerChild* child =
         reinterpret_cast<GtkFloatingContainerChild*>(children->data);
     children = children->next;
 
     (*callback)(child->widget, callback_data);
   }
@@ skipping 120 matching lines @@
   child_info->x = 0;
   child_info->y = 0;
 
   gtk_widget_set_parent(widget, GTK_WIDGET(container));
 
   container->floating_children =
       g_list_append(container->floating_children, child_info);
 }
 
 G_END_DECLS