[gnome-shell] ExtensionPrefs: remove unused GSettings object

[Giovanni Campagna <gcampagna src gnome org>]

commit 36d9cc329d445ac10e37010eef139a9ee32d0515
Author: Giovanni Campagna <gcampagna gnome org>
Date:   Fri Mar 20 12:33:25 2015 -0700

    ExtensionPrefs: remove unused GSettings object
    
    Each ExtensionRow has its own
    
    https://bugzilla.gnome.org/show_bug.cgi?id=746509

 js/extensionPrefs/main.js |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/js/extensionPrefs/main.js b/js/extensionPrefs/main.js
index e4d2e96..e17a05a 100644
--- a/js/extensionPrefs/main.js
+++ b/js/extensionPrefs/main.js
@@ -54,7 +54,6 @@ const Application = new Lang.Class({
         this._startupUuid = null;
         this._loaded = false;
         this._skipMainWindow = false;
-        this._settings = new Gio.Settings({ schema_id: 'org.gnome.shell' });
     },
 
     _extensionAvailable: function(uuid) {