[gtkmm] Demo: IconTheme: Don't use deprecated builtin-icon API.

[Murray Cumming <murrayc src gnome org>]

commit c4e1b11ff91574812614d441bc5c6f8c8c183464
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Jun 30 11:31:55 2015 +0200

    Demo: IconTheme: Don't use deprecated builtin-icon API.
    
    By the way, there is now a separate icon browser in gtk+'s demos/.
    Maybe we should create a version of that instead. I think this C++
    code never corresponded to anything in the GTK+ demo.

 demos/gtk-demo/example_icontheme.cc |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)
---
diff --git a/demos/gtk-demo/example_icontheme.cc b/demos/gtk-demo/example_icontheme.cc
index a2df468..7421ec0 100644
--- a/demos/gtk-demo/example_icontheme.cc
+++ b/demos/gtk-demo/example_icontheme.cc
@@ -179,17 +179,14 @@ Glib::RefPtr<Gtk::TreeModel> Example_IconTheme::create_model()
       }
     }
 
-    Gtk::IconInfo icon_info = m_IconTheme->lookup_icon(*iconiter, minsize, Gtk::ICON_LOOKUP_USE_BUILTIN);
+    Gtk::IconInfo icon_info = m_IconTheme->lookup_icon(*iconiter, minsize);
 
     // Populate icon column.
     if (icon_info)
     {
       try
       {
-        if (icon_info.get_filename().empty())
-          row[m_columns.icon] = icon_info.get_builtin_pixbuf();
-        else
-          row[m_columns.icon] = icon_info.load_icon();
+        row[m_columns.icon] = icon_info.load_icon();
       }
       catch (const Gdk::PixbufError& err)
       {
@@ -269,7 +266,7 @@ void Example_IconTheme::on_selection_changed()
         std::max_element(sizes.begin(), sizes.end());
       const int maxsize = (sizeiter != sizes.end() && *sizeiter > 48) ? *sizeiter : 48;
 
-      m_Image.set(m_IconTheme->load_icon(icon_name, maxsize, Gtk::ICON_LOOKUP_USE_BUILTIN));
+      m_Image.set(m_IconTheme->load_icon(icon_name, maxsize));
     }
     else
     {