[gnome-photos] base-item: Mark it as an abstract type

[Debarshi Ray <debarshir src gnome org>]

commit ffe19620e4e880c41b9655596e9e6e9d4e60d020
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Jun 18 17:41:08 2014 +0200

    base-item: Mark it as an abstract type
    
    Fixes: https://bugzilla.gnome.org/731865

 src/photos-base-item.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/photos-base-item.c b/src/photos-base-item.c
index ef0fbac..b636d12 100644
--- a/src/photos-base-item.c
+++ b/src/photos-base-item.c
@@ -106,9 +106,10 @@ static guint signals[LAST_SIGNAL] = { 0 };
 static void photos_base_item_filterable_iface_init (PhotosFilterableInterface *iface);
 
 
-G_DEFINE_TYPE_WITH_CODE (PhotosBaseItem, photos_base_item, G_TYPE_OBJECT,
-                         G_ADD_PRIVATE (PhotosBaseItem)
-                         G_IMPLEMENT_INTERFACE (PHOTOS_TYPE_FILTERABLE, 
photos_base_item_filterable_iface_init));
+G_DEFINE_ABSTRACT_TYPE_WITH_CODE (PhotosBaseItem, photos_base_item, G_TYPE_OBJECT,
+                                  G_ADD_PRIVATE (PhotosBaseItem)
+                                  G_IMPLEMENT_INTERFACE (PHOTOS_TYPE_FILTERABLE,
+                                                         photos_base_item_filterable_iface_init));
 
 
 static GThreadPool *create_thumbnail_pool;