[gtk+] check button: Update for new box gadget functionality

[Matthias Clasen <matthiasc src gnome org>]

commit 793f843b0875e09d88699aa4e3f806f3b1185e1f
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Oct 28 12:58:18 2016 -0400

    check button: Update for new box gadget functionality
    
    The box gadget now does the render node conversion for
    all its children, so we have less work to do.

 gtk/gtkcheckbutton.c |   23 ++++-------------------
 1 files changed, 4 insertions(+), 19 deletions(-)
---
diff --git a/gtk/gtkcheckbutton.c b/gtk/gtkcheckbutton.c
index 646ea6a..5d0d8af 100644
--- a/gtk/gtkcheckbutton.c
+++ b/gtk/gtkcheckbutton.c
@@ -387,28 +387,13 @@ gtk_check_button_get_render_node (GtkWidget   *widget,
                                   GskRenderer *renderer)
 {
   GtkCheckButtonPrivate *priv = gtk_check_button_get_instance_private (GTK_CHECK_BUTTON (widget));
-  GskRenderNode *res;
-  GskRenderNode *node;
 
   if (!gtk_toggle_button_get_mode (GTK_TOGGLE_BUTTON (widget)))
     return GTK_WIDGET_CLASS (gtk_check_button_parent_class)->get_render_node (widget, renderer);
-
-  res = gtk_css_gadget_get_render_node (priv->gadget,
-                                        renderer,
-                                        gtk_widget_has_visible_focus (widget));
-
-  if (res == NULL)
-    return NULL;
-
-  node = gtk_css_gadget_get_render_node (priv->indicator_gadget,
-                                         renderer,
-                                         FALSE);
-  gsk_render_node_append_child (res, node);
-  gsk_render_node_unref (node);
-
-  gtk_container_propagate_render_node (GTK_CONTAINER (widget), renderer, res);
-
-  return res;
+  else
+    return gtk_css_gadget_get_render_node (priv->gadget,
+                                           renderer,
+                                           gtk_widget_has_visible_focus (widget));
 }
 
 GtkCssNode *