[gnome-shell] screenShield: Add missing import

[Florian MÃllner <fmuellner src gnome org>]

commit b9226fbcbddc2f76663b1355c189e4e9b46801de
Author: Florian MÃllner <fmuellner gnome org>
Date:   Fri Aug 17 19:30:46 2012 +0200

    screenShield: Add missing import

 js/ui/screenShield.js |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/screenShield.js b/js/ui/screenShield.js
index 0fb4107..abd68bd 100644
--- a/js/ui/screenShield.js
+++ b/js/ui/screenShield.js
@@ -2,6 +2,7 @@
 
 const Clutter = imports.gi.Clutter;
 const Gio = imports.gi.Gio;
+const GLib = imports.gi.GLib;
 const GnomeDesktop = imports.gi.GnomeDesktop;
 const Lang = imports.lang;
 const Meta = imports.gi.Meta;