[gnome-shell] background: Remove unused variable

[Jasper St. Pierre <jstpierre src gnome org>]

commit adb49bdf0bdba10658cbf81aeb5164b9cfc95eea
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Dec 3 17:27:28 2013 -0500

    background: Remove unused variable
    
    https://bugzilla.gnome.org/show_bug.cgi?id=719803

 js/ui/background.js |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/js/ui/background.js b/js/ui/background.js
index af69f9d..06db8f0 100644
--- a/js/ui/background.js
+++ b/js/ui/background.js
@@ -728,8 +728,8 @@ const BackgroundManager = new Lang.Class({
         }
     },
 
-    _updateBackground: function(background, monitorIndex) {
-        let newBackground = this._createBackground(monitorIndex);
+    _updateBackground: function(background) {
+        let newBackground = this._createBackground();
         newBackground.vignetteSharpness = background.vignetteSharpness;
         newBackground.brightness = background.brightness;
         newBackground.visible = background.visible;
@@ -778,7 +778,7 @@ const BackgroundManager = new Lang.Class({
         background.changeSignalId = background.connect('changed', Lang.bind(this, function() {
             background.disconnect(background.changeSignalId);
             background.changeSignalId = 0;
-            this._updateBackground(background, this._monitorIndex);
+            this._updateBackground(background);
         }));
 
         background.actor.connect('destroy', Lang.bind(this, function() {