[gtk+] Stop using the GdkScreen get_setting vfunc

[Matthias Clasen <matthiasc src gnome org>]

commit 6dbb1e20a66743ee088790cfe8ac6396d96033cd
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 30 16:45:36 2017 -0400

    Stop using the GdkScreen get_setting vfunc
    
    We can now call the GdkDisplay implementation instead.

 gdk/gdkscreen.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/gdk/gdkscreen.c b/gdk/gdkscreen.c
index 3648f7d..9e25ac1 100644
--- a/gdk/gdkscreen.c
+++ b/gdk/gdkscreen.c
@@ -291,9 +291,5 @@ gdk_screen_get_setting (GdkScreen   *screen,
                        const gchar *name,
                        GValue      *value)
 {
-  g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
-  g_return_val_if_fail (name != NULL, FALSE);
-  g_return_val_if_fail (value != NULL, FALSE);
-
-  return GDK_SCREEN_GET_CLASS (screen)->get_setting (screen, name, value);
+  return gdk_display_get_setting (gdk_screen_get_display (screen), name, value);
 }