API: x11: Remove gdk_x11_window_get_drawable_impl()

It's not used anymore

docs/reference/gdk/gdk3-sections.txt

@@ -1028,7 +1028,6 @@ gdk_x11_get_xatom_name_for_display
 <SUBSECTION Private>
 GDK_HAVE_WCHAR_H
 GDK_HAVE_WCTYPE_H
-gdk_x11_window_get_drawable_impl
 </SECTION>
 
 <SECTION>

gdk/gdk.symbols

@@ -567,7 +567,6 @@ gdk_x11_screen_lookup_visual
 gdk_x11_screen_supports_net_wm_hint
 gdk_x11_ungrab_server
 gdk_x11_visual_get_xvisual
-gdk_x11_window_get_drawable_impl
 gdk_x11_window_get_xid
 gdk_x11_window_move_to_current_desktop
 gdk_x11_window_set_user_time

gdk/x11/gdkdrawable-x11.c

@@ -134,12 +134,6 @@ gdk_x11_drawable_get_xdisplay (GdkDrawable *drawable)
     return GDK_SCREEN_XDISPLAY (GDK_DRAWABLE_IMPL_X11 (get_impl_drawable (drawable))->screen);
 }
 
-GdkDrawable *
-gdk_x11_window_get_drawable_impl (GdkWindow *window)
-{
-  return ((GdkWindowObject *)window)->impl;
-}
-
 static void
 gdk_x11_cairo_surface_destroy (void *data)
 {

gdk/x11/gdkdrawable-x11.h

@@ -68,7 +68,6 @@ GType _gdk_drawable_impl_x11_get_type (void);
 /* Note that the following take GdkDrawableImplX11, not the wrapper drawable */
 void _gdk_x11_drawable_finish           (GdkDrawable  *drawable);
 void _gdk_x11_drawable_update_size      (GdkDrawable  *drawable);
-GdkDrawable *gdk_x11_window_get_drawable_impl (GdkWindow *window);
 
 G_END_DECLS
 

gdk/x11/gdkx.h

@@ -57,7 +57,6 @@ G_BEGIN_DECLS
 
 Display *gdk_x11_drawable_get_xdisplay    (GdkDrawable *drawable);
 Window   gdk_x11_window_get_xid           (GdkWindow   *window);
-GdkDrawable *gdk_x11_window_get_drawable_impl (GdkWindow *window);
 Display *gdk_x11_cursor_get_xdisplay      (GdkCursor   *cursor);
 Cursor   gdk_x11_cursor_get_xcursor       (GdkCursor   *cursor);
 Display *gdk_x11_display_get_xdisplay     (GdkDisplay  *display);