[gitg] Use the method from the base class

[Ignacio Casal Quinteiro <icq src gnome org>]

commit ff70730e0b39f1652a2c115ad3ff526474fe8884
Author: Techlive Zheng <techlivezheng gmail com>
Date:   Sat Jun 1 02:05:45 2013 +0800

    Use the method from the base class

 plugins/history/gitg-history-navigation.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/history/gitg-history-navigation.vala b/plugins/history/gitg-history-navigation.vala
index edec6f3..e3a42b2 100644
--- a/plugins/history/gitg-history-navigation.vala
+++ b/plugins/history/gitg-history-navigation.vala
@@ -506,7 +506,7 @@ namespace GitgHistory
                public new Navigation model
                {
                        get { return base.get_model() as Navigation; }
-                       set { set_model(value); build_ui(); }
+                       set { base.set_model(value); build_ui(); }
                }
 
                private bool select_first_in(Gtk.TreeIter? parent, bool seldef)