[gtk+] window: Remove unused destroy_draw_context vfunc

[Benjamin Otte <otte src gnome org>]

commit 1492175a28ad2b01e2711152f306a77586fb1e86
Author: Benjamin Otte <otte redhat com>
Date:   Sun Nov 20 07:27:00 2016 +0100

    window: Remove unused destroy_draw_context vfunc

 gdk/gdkwindow.c     |   11 +++--------
 gdk/gdkwindowimpl.h |    2 --
 2 files changed, 3 insertions(+), 10 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index f3661b8..de2a841 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -2933,8 +2933,6 @@ void
 gdk_window_end_draw_frame (GdkWindow         *window,
                            GdkDrawingContext *context)
 {
-  GdkWindowImplClass *impl_class;
-
   g_return_if_fail (GDK_IS_WINDOW (window));
   g_return_if_fail (GDK_IS_DRAWING_CONTEXT (context));
 
@@ -2945,17 +2943,14 @@ gdk_window_end_draw_frame (GdkWindow         *window,
                   "gdk_window_end_draw_frame().", window);
       return;
     }
+  g_return_if_fail (window->drawing_context == context);
 
   if (gdk_window_has_native (window) && gdk_window_is_toplevel (window))
     gdk_window_end_paint_internal (window);
 
-  impl_class = GDK_WINDOW_IMPL_GET_CLASS (window->impl);
-  if (impl_class->destroy_draw_context != NULL)
-    impl_class->destroy_draw_context (window, context);
-  else
-    g_object_unref (context);
-
   window->drawing_context = NULL;
+
+  g_object_unref (context);
 }
 
 /*< private >
diff --git a/gdk/gdkwindowimpl.h b/gdk/gdkwindowimpl.h
index 680997d..ab1c180 100644
--- a/gdk/gdkwindowimpl.h
+++ b/gdk/gdkwindowimpl.h
@@ -307,8 +307,6 @@ struct _GdkWindowImplClass
 
   GdkDrawingContext *(* create_draw_context)  (GdkWindow            *window,
                                                const cairo_region_t *region);
-  void               (* destroy_draw_context) (GdkWindow            *window,
-                                               GdkDrawingContext    *context);
 };
 
 /* Interface Functions */