[gnome-boxes] app-window: Drop use of AppWindow singleton

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 315c9543856da6db97c9c271c4269fabdd4fe0f6
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed Jul 16 12:51:40 2014 +0200

    app-window: Drop use of AppWindow singleton
    
    App.window was accessed in AppWindow class when the current object should
    be used.
    
    This is needed to drop the use of AppWindow singleton and therefore to
    make multiple windows possible.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732098

 src/app-window.vala |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/app-window.vala b/src/app-window.vala
index d9fc665..5e53308 100644
--- a/src/app-window.vala
+++ b/src/app-window.vala
@@ -260,14 +260,14 @@ private class Boxes.AppWindow: Gtk.ApplicationWindow, Boxes.UI {
             return true;
         } else if (event.keyval == Gdk.Key.Left && // ALT + Left -> back
                    (event.state & default_modifiers) == Gdk.ModifierType.MOD1_MASK) {
-            App.window.topbar.click_back_button ();
+            topbar.click_back_button ();
             return true;
         } else if (event.keyval == Gdk.Key.Right && // ALT + Right -> forward
                    (event.state & default_modifiers) == Gdk.ModifierType.MOD1_MASK) {
-            App.window.topbar.click_forward_button ();
+            topbar.click_forward_button ();
             return true;
         } else if (event.keyval == Gdk.Key.Escape) { // ESC -> cancel
-            App.window.topbar.click_cancel_button ();
+            topbar.click_cancel_button ();
         }
 
         return false;