[gtk+] testsuite: Remove unused function

[Emmanuele Bassi <ebassi src gnome org>]

commit bc0a08eced7f6d014859d2e3486773247433518c
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed May 3 15:21:20 2017 +0100

    testsuite: Remove unused function
    
    Silence a compiler warning.

 testsuite/gtk/window.c |    8 --------
 1 files changed, 0 insertions(+), 8 deletions(-)
---
diff --git a/testsuite/gtk/window.c b/testsuite/gtk/window.c
index 59454cc..ad0a40c 100644
--- a/testsuite/gtk/window.c
+++ b/testsuite/gtk/window.c
@@ -340,14 +340,6 @@ test_show_hide3 (void)
   gtk_widget_destroy (window);
 }
 
-static gboolean
-on_map_event (GtkWidget *window)
-{
-  gtk_main_quit ();
-
-  return FALSE;
-}
-
 int
 main (int argc, char *argv[])
 {