[gtk] Remove unused signal enum values

[Matthias Clasen <matthiasc src gnome org>]

commit 14ecc9ec7e09282723df5729bc8b25653dc4af73
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Feb 12 18:24:59 2020 -0500

    Remove unused signal enum values
    
    GtkWidget lost even more signals, so we don't need
    these enum values anymore.

 gtk/gtkwidget.c | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index ff51d12dfe..9f8876beb5 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -511,17 +511,13 @@ enum {
   STATE_FLAGS_CHANGED,
   DIRECTION_CHANGED,
   GRAB_NOTIFY,
-  CHILD_NOTIFY,
   MNEMONIC_ACTIVATE,
   MOVE_FOCUS,
   KEYNAV_FAILED,
   POPUP_MENU,
   ACCEL_CLOSURES_CHANGED,
-  DISPLAY_CHANGED,
   CAN_ACTIVATE_ACCEL,
   QUERY_TOOLTIP,
-  DRAG_FAILED,
-  STYLE_UPDATED,
   LAST_SIGNAL
 };