[gnome-shell] Fix bad rebase and regression in 3f6f597

[Giovanni Campagna <gcampagna src gnome org>]

commit ac0bd3b1161e77cec147721ccafcb681570f2ddb
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Thu Jan 31 16:07:16 2013 +0100

    Fix bad rebase and regression in 3f6f597

 js/ui/lightbox.js |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/lightbox.js b/js/ui/lightbox.js
index b876d97..cf80bd3 100644
--- a/js/ui/lightbox.js
+++ b/js/ui/lightbox.js
@@ -3,6 +3,7 @@
 const Clutter = imports.gi.Clutter;
 const Lang = imports.lang;
 const Meta = imports.gi.Meta;
+const Signals = imports.signals;
 const St = imports.gi.St;
 
 const Params = imports.misc.params;