[glom] AppWindow: Use std::unique_ptr<> instead of naked new.

[Murray Cumming <murrayc src gnome org>]

commit 1f9d9947c513e79ff06276c17d37246e0859dda8
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Feb 5 11:08:47 2016 +0100

    AppWindow: Use std::unique_ptr<> instead of naked new.
    
    I am not very happy with passing the raw pointer to gtkmm's
    attach_to_widget(), but that seems to be the normal use of
    unique_ptr<>::operator*() and unique_ptr<>::get(),
    as long as we don't expect the receiving API to take any
    ownership.

 glom/appwindow.cc |    3 +--
 glom/appwindow.h  |    2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/glom/appwindow.cc b/glom/appwindow.cc
index a2c4520..6c8651d 100644
--- a/glom/appwindow.cc
+++ b/glom/appwindow.cc
@@ -84,7 +84,6 @@ AppWindow::AppWindow(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>&
 : GlomBakery::AppWindow_WithDoc("Glom"),
   Gtk::ApplicationWindow(cobject),
   m_builder(builder),
-  m_menubar(nullptr),
   m_pVBox(nullptr),
   m_VBox_PlaceHolder(Gtk::ORIENTATION_VERTICAL),
   m_pBoxTop(nullptr),
@@ -118,7 +117,7 @@ AppWindow::AppWindow(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>&
   if(!gmenu)
     g_warning("GMenu not found");
 
-  m_menubar = new Gtk::MenuBar(gmenu);
+  m_menubar = std::make_unique<Gtk::MenuBar>(gmenu);
   m_menubar->show();
   m_pBoxTop->pack_start(*m_menubar, Gtk::PACK_SHRINK);
 
diff --git a/glom/appwindow.h b/glom/appwindow.h
index a9f43c1..d38fefd 100644
--- a/glom/appwindow.h
+++ b/glom/appwindow.h
@@ -209,7 +209,7 @@ protected:
 
   //Menu Builder and Actions
   Glib::RefPtr<Gtk::Builder> m_builder;
-  Gtk::MenuBar* m_menubar;
+  std::unique_ptr<Gtk::MenuBar> m_menubar;
   Glib::RefPtr<Gio::SimpleActionGroup> m_refActionGroup_File,
      m_refActionGroup_Edit, m_refActionGroup_Tables,
      m_refActionGroup_Developer, m_refActionGroup_Reports;