[gtk+] GDK W32: Remove stray debug code

[Руслан Ижбулатов <ruslanizhb src gnome org>]

commit bcc77e169cb0a5219ef5c1f0554b90978ca0d17f
Author: Руслан Ижбулатов <lrn1986 gmail com>
Date:   Sun Dec 3 06:08:44 2017 +0000

    GDK W32: Remove stray debug code
    
    I have no idea how this slipped into master (these two lines are not present
    in the same commit that went into gtk-3-22).

 gdk/win32/gdkwindow-win32.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/gdk/win32/gdkwindow-win32.c b/gdk/win32/gdkwindow-win32.c
index 5e784e8..3756fb4 100644
--- a/gdk/win32/gdkwindow-win32.c
+++ b/gdk/win32/gdkwindow-win32.c
@@ -238,14 +238,12 @@ gdk_window_impl_win32_finalize (GObject *object)
 
   if (window_impl->cache_surface)
     {
-      cairo_surface_t_note_about_to_dereference (window_impl->cache_surface);
       cairo_surface_destroy (window_impl->cache_surface);
       window_impl->cache_surface = NULL;
     }
 
   if (window_impl->cairo_surface)
     {
-      cairo_surface_t_note_about_to_dereference (window_impl->cairo_surface);
       cairo_surface_destroy (window_impl->cairo_surface);
       window_impl->cairo_surface = NULL;
     }