[gtk+] Drop an unused function

[Matthias Clasen <matthiasc src gnome org>]

commit c5f2f86ff9d365048970f479f89b7f00fb0c4bb1
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Nov 30 19:58:08 2014 -0500

    Drop an unused function

 testsuite/reftests/gtk-reftest.c |    8 --------
 1 files changed, 0 insertions(+), 8 deletions(-)
---
diff --git a/testsuite/reftests/gtk-reftest.c b/testsuite/reftests/gtk-reftest.c
index 42d914f..19f3899 100644
--- a/testsuite/reftests/gtk-reftest.c
+++ b/testsuite/reftests/gtk-reftest.c
@@ -209,14 +209,6 @@ remove_extra_css (GtkStyleProvider *provider)
                                                 provider);
 }
 
-static gboolean
-quit_when_idle (gpointer loop)
-{
-  g_main_loop_quit (loop);
-
-  return G_SOURCE_REMOVE;
-}
-
 static void
 save_image (cairo_surface_t *surface,
             const char      *test_name,