[mutter] keybindings: Remove unneeded forward declaration

[Carlos Garnacho <carlosg src gnome org>]

commit 456698c814d8b49e7b5e35d61bf1d313b86d6d0b
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Mon Jul 15 18:35:38 2019 +0200

    keybindings: Remove unneeded forward declaration
    
    The functions `grab_key_bindings()` and `ungrab_key_bindings()` are not
    used before their actual definition, there is no need to have a forward
    declaration for those.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/685

 src/core/keybindings.c | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index 4e8493211..19b0a43a5 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -182,9 +182,6 @@ static gboolean process_keyboard_resize_grab (MetaDisplay     *display,
                                               MetaWindow      *window,
                                               ClutterKeyEvent *event);
 
-static void grab_key_bindings           (MetaDisplay *display);
-static void ungrab_key_bindings         (MetaDisplay *display);
-
 static GHashTable *key_handlers;
 static GHashTable *external_grabs;