[gnome-control-center] user-accounts: Remove unused callback

[Bastien Nocera <hadess src gnome org>]

commit e168e2a665c2646765a4bb6e2bb146790425d4c5
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Apr 28 18:36:17 2014 +0200

    user-accounts: Remove unused callback
    
    Fallout from 00dacd5854161d6a87fee513ea65b63fdde6025d
    
    https://bugzilla.gnome.org/show_bug.cgi?id=724299

 panels/user-accounts/um-history-dialog.c |   19 -------------------
 1 files changed, 0 insertions(+), 19 deletions(-)
---
diff --git a/panels/user-accounts/um-history-dialog.c b/panels/user-accounts/um-history-dialog.c
index f63029d..fe753a6 100644
--- a/panels/user-accounts/um-history-dialog.c
+++ b/panels/user-accounts/um-history-dialog.c
@@ -57,25 +57,6 @@ get_widget (UmHistoryDialog *um,
 }
 
 static void
-close_history_dialog (GtkButton       *button,
-                      UmHistoryDialog *um)
-{
-        gtk_widget_hide (um->dialog);
-
-        um_history_dialog_set_user (um, NULL);
-
-        if (um->week) {
-                g_date_time_unref (um->week);
-                um->week = NULL;
-        }
-
-        if (um->current_week) {
-                g_date_time_unref (um->current_week);
-                um->current_week = NULL;
-        }
-}
-
-static void
 show_week_label (UmHistoryDialog *um)
 {
         gchar *label, *from, *to;