[gnome-shell] gdm: Only create the Manager we're going to use

[Adel Gadllah <agadllah src gnome org>]

commit c7182589d299e48d2e86ec8bc64eac95e7d441ab
Author: Jan Alexander Steffens (heftig) <jan steffens gmail com>
Date:   Fri Mar 16 17:07:47 2012 +0100

    gdm: Only create the Manager we're going to use
    
    Otherwise gnome-shell crashes when systemd is installed but not in use,
    because bus activation of logind fails.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=672240

 js/gdm/powerMenu.js |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/js/gdm/powerMenu.js b/js/gdm/powerMenu.js
index 59ebc42..32edccd 100644
--- a/js/gdm/powerMenu.js
+++ b/js/gdm/powerMenu.js
@@ -33,10 +33,13 @@ const PowerMenuButton = new Lang.Class({
 
     _init: function() {
         this.parent('system-shutdown', null);
-        this._consoleKitManager = new ConsoleKit.ConsoleKitManager();
-        this._systemdLoginManager = new Systemd.SystemdLoginManager();
         this._upClient = new UPowerGlib.Client();
 
+        if (Systemd.haveSystemd())
+            this._systemdLoginManager = new Systemd.SystemdLoginManager();
+        else
+            this._consoleKitManager = new ConsoleKit.ConsoleKitManager();
+
         this._createSubMenu();
 
         this._upClient.connect('notify::can-suspend',