[gtk+] Remove leftover API from headers

[Matthias Clasen <matthiasc src gnome org>]

commit 951456dbed97a9d4ff7fc404ecbbf1f6c7f86029
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Dec 26 11:01:38 2017 -0500

    Remove leftover API from headers
    
    gdk_window_mark_paint_from_clip was removed in
    bddfd7bb41cebd9b4e8ea418ce4d8e1f11822e81

 docs/reference/gdk/gdk4-sections.txt |    1 -
 gdk/gdkwindow.h                      |    5 -----
 2 files changed, 0 insertions(+), 6 deletions(-)
---
diff --git a/docs/reference/gdk/gdk4-sections.txt b/docs/reference/gdk/gdk4-sections.txt
index c63435a..bd54e63 100644
--- a/docs/reference/gdk/gdk4-sections.txt
+++ b/docs/reference/gdk/gdk4-sections.txt
@@ -289,7 +289,6 @@ gdk_window_get_scale_factor
 gdk_window_set_opaque_region
 gdk_window_create_gl_context
 gdk_window_create_vulkan_context
-gdk_window_mark_paint_from_clip
 
 <SUBSECTION>
 gdk_window_get_clip_region
diff --git a/gdk/gdkwindow.h b/gdk/gdkwindow.h
index 62f3490..9e2a30d 100644
--- a/gdk/gdkwindow.h
+++ b/gdk/gdkwindow.h
@@ -587,11 +587,6 @@ cairo_region_t *gdk_window_get_clip_region  (GdkWindow          *window);
 GDK_AVAILABLE_IN_ALL
 cairo_region_t *gdk_window_get_visible_region(GdkWindow         *window);
 
-
-GDK_AVAILABLE_IN_3_16
-void         gdk_window_mark_paint_from_clip (GdkWindow          *window,
-                                              cairo_t            *cr);
-
 GDK_AVAILABLE_IN_3_90
 GdkDrawingContext *gdk_window_begin_draw_frame  (GdkWindow            *window,
                                                  GdkDrawContext       *context,