[gnome-control-center] keyboard: Remove unused variable

[Bastien Nocera <hadess src gnome org>]

commit b32f58ed006b41539f2d4fae23b9ce584e87c8fd
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Sep 8 11:42:16 2016 +0200

    keyboard: Remove unused variable
    
    grab_device was added in a0a15588 but unused there or since.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769314

 panels/keyboard/cc-keyboard-shortcut-editor.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/panels/keyboard/cc-keyboard-shortcut-editor.c b/panels/keyboard/cc-keyboard-shortcut-editor.c
index eac83b5..8fc9b9b 100644
--- a/panels/keyboard/cc-keyboard-shortcut-editor.c
+++ b/panels/keyboard/cc-keyboard-shortcut-editor.c
@@ -54,8 +54,6 @@ struct _CcKeyboardShortcutEditor
 
   CcShortcutEditorMode mode;
 
-  GdkDevice          *grab_device;
-
   CcKeyboardManager  *manager;
   CcKeyboardItem     *item;
   GBinding           *reset_item_binding;