[gtk+] gdkwindow: Correct a signature

[Jasper St. Pierre <jstpierre src gnome org>]

commit 9036ed0d67ae88a0fe2e0403dcdf52ef7d2db942
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sat Jun 21 11:25:16 2014 -0400

    gdkwindow: Correct a signature
    
    We removed the parameter from callers and from the implementation, but
    not from the signature up top. I didn't notice because the branch I was
    working on removed the signature entirely.

 gdk/gdkwindow.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index a0da4c4..ad93c9b 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -160,8 +160,7 @@ static void gdk_window_get_property (GObject      *object,
                                      GValue       *value,
                                      GParamSpec   *pspec);
 
-static void gdk_window_clear_backing_region (GdkWindow *window,
-                                            cairo_region_t *region);
+static void gdk_window_clear_backing_region (GdkWindow *window);
 
 static void recompute_visible_regions   (GdkWindow *private,
                                         gboolean recalculate_children);