[gtk] text: Remove an outdated comment

[Matthias Clasen <matthiasc src gnome org>]

commit fb06b7fa94ec7c1d4d0728b9850fb8d8fb803f4f
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jul 23 15:14:38 2019 -0400

    text: Remove an outdated comment

 gtk/gtktext.c | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/gtk/gtktext.c b/gtk/gtktext.c
index 61e5af6069..064447be11 100644
--- a/gtk/gtktext.c
+++ b/gtk/gtktext.c
@@ -2190,9 +2190,6 @@ gtk_text_size_allocate (GtkWidget *widget,
                                 -1);
     }
 
-  /* Do this here instead of gtk_text_size_allocate() so it works
-   * inside spinbuttons, which don't chain up.
-   */
   if (gtk_widget_get_realized (widget))
     gtk_text_recompute (self);