[gtk/wip/baedert/for-master] csswidgetnode: Remove an outdated GTK_IS_CONTAINER check

[Timm Bäder <baedert src gnome org>]

commit 3b89ecae099b76e8c59a1d3f450897ab0b2bd904
Author: Timm Bäder <mail baedert org>
Date:   Thu May 7 13:14:54 2020 +0200

    csswidgetnode: Remove an outdated GTK_IS_CONTAINER check
    
    None of this depends on the widget being a container anymore.

 gtk/gtkcsswidgetnode.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gtk/gtkcsswidgetnode.c b/gtk/gtkcsswidgetnode.c
index ec49fbeea7..c3674fc76f 100644
--- a/gtk/gtkcsswidgetnode.c
+++ b/gtk/gtkcsswidgetnode.c
@@ -69,8 +69,7 @@ gtk_css_widget_node_dequeue_validate (GtkCssNode *node)
   GtkCssWidgetNode *widget_node = GTK_CSS_WIDGET_NODE (node);
 
   if (widget_node->widget &&
-      GTK_IS_ROOT (widget_node->widget) &&
-      GTK_IS_CONTAINER (widget_node->widget))
+      GTK_IS_ROOT (widget_node->widget))
     gtk_widget_remove_tick_callback (widget_node->widget,
                                      widget_node->validate_cb_id);
 }