[gnome-panel] panel-icon-chooser: avoid deprecated g_type_class_add_private

[Alberts Muktupāvels <muktupavels src gnome org>]

commit e3bacc4a4de7b2d6e8debd7622cddf132aa92c43
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Sep 13 02:35:24 2018 +0300

    panel-icon-chooser: avoid deprecated g_type_class_add_private

 gnome-panel/libpanel-util/panel-icon-chooser.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)
---
diff --git a/gnome-panel/libpanel-util/panel-icon-chooser.c b/gnome-panel/libpanel-util/panel-icon-chooser.c
index 8c6f84ce3..64dbe747c 100644
--- a/gnome-panel/libpanel-util/panel-icon-chooser.c
+++ b/gnome-panel/libpanel-util/panel-icon-chooser.c
@@ -59,9 +59,7 @@ enum {
 
 static guint panel_icon_chooser_signals[LAST_SIGNAL] = { 0 };
 
-#define PANEL_ICON_CHOOSER_GET_PRIVATE(o)  (PANEL_ICON_CHOOSER (o)->priv)
-
-G_DEFINE_TYPE (PanelIconChooser, panel_icon_chooser, GTK_TYPE_BUTTON)
+G_DEFINE_TYPE_WITH_PRIVATE (PanelIconChooser, panel_icon_chooser, GTK_TYPE_BUTTON)
 
 static void _panel_icon_chooser_clicked (GtkButton *button);
 static void _panel_icon_chooser_style_set (GtkWidget *widget,
@@ -189,9 +187,6 @@ panel_icon_chooser_class_init (PanelIconChooserClass *class)
 
        gtkbutton_class->clicked = _panel_icon_chooser_clicked;
 
-       g_type_class_add_private (class,
-                                 sizeof (PanelIconChooserPrivate));
-
        panel_icon_chooser_signals[CHANGED] =
                g_signal_new ("changed",
                              G_TYPE_FROM_CLASS (gobject_class),
@@ -228,9 +223,7 @@ panel_icon_chooser_init (PanelIconChooser *chooser)
 {
        PanelIconChooserPrivate *priv;
 
-       priv = G_TYPE_INSTANCE_GET_PRIVATE (chooser,
-                                           PANEL_TYPE_ICON_CHOOSER,
-                                           PanelIconChooserPrivate);
+       priv = panel_icon_chooser_get_instance_private (chooser);
 
        chooser->priv = priv;