[gtkmm] Adapt to cairomm enum change.

[Murray Cumming <murrayc src gnome org>]

commit 27c0b0549c6018fefa27ccd9ae387ace02778a16
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Apr 19 13:06:10 2017 +0200

    Adapt to cairomm enum change.

 gdk/src/window.hg |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk/src/window.hg b/gdk/src/window.hg
index 1342acf..80a3cb6 100644
--- a/gdk/src/window.hg
+++ b/gdk/src/window.hg
@@ -228,8 +228,8 @@ public:
   #m4 _CONVERSION(`::Cairo::Content',`cairo_content_t',`(cairo_content_t)($3)')
   _WRAP_METHOD(::Cairo::RefPtr< ::Cairo::Surface> create_similar_surface(::Cairo::Content content, int 
width,  int height), gdk_window_create_similar_surface )
 
-  #m4 _CONVERSION(`::Cairo::Format',`cairo_format_t',`(cairo_format_t)($3)')
-    _WRAP_METHOD(::Cairo::RefPtr< ::Cairo::Surface> create_similar_image_surface(::Cairo::Format format, int 
width, int height, int scale), gdk_window_create_similar_image_surface )
+  #m4 _CONVERSION(`::Cairo::Surface::Format',`cairo_format_t',`(cairo_format_t)($3)')
+    _WRAP_METHOD(::Cairo::RefPtr< ::Cairo::Surface> create_similar_image_surface(::Cairo::Surface::Format 
format, int width, int height, int scale), gdk_window_create_similar_image_surface )
 
   _WRAP_METHOD(void beep(), gdk_window_beep)