[gtk] menu: Remove an incorrect comment

[Timm Bäder <baedert src gnome org>]

commit 160a4208ed48b044e9cfc05ae66eb6d508ea0e6d
Author: Timm Bäder <mail baedert org>
Date:   Mon Feb 12 11:13:17 2018 +0100

    menu: Remove an incorrect comment
    
    They are not missing, they are snapshot when chaining up.

 gtk/gtkmenu.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/gtk/gtkmenu.c b/gtk/gtkmenu.c
index 95562ab9fb..6461a5b669 100644
--- a/gtk/gtkmenu.c
+++ b/gtk/gtkmenu.c
@@ -2742,8 +2742,6 @@ static void
 gtk_menu_snapshot (GtkWidget   *widget,
                    GtkSnapshot *snapshot)
 {
-  /* XXX The arrows *might* be missing here */
-
   gtk_snapshot_push_clip (snapshot,
                           &GRAPHENE_RECT_INIT(
                             0, 0,