[mutter] cogl/onscreen: Remove unused _cogl_onscreen_new()

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit ffde1c0124c7ce33d15aea0c3da8b36d37f83247
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Oct 12 23:30:58 2020 +0200

    cogl/onscreen: Remove unused _cogl_onscreen_new()
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1496

 cogl/cogl/cogl-onscreen-private.h |  3 ---
 cogl/cogl/cogl-onscreen.c         | 29 -----------------------------
 2 files changed, 32 deletions(-)
---
diff --git a/cogl/cogl/cogl-onscreen-private.h b/cogl/cogl/cogl-onscreen-private.h
index 480ca50761..1059018800 100644
--- a/cogl/cogl/cogl-onscreen-private.h
+++ b/cogl/cogl/cogl-onscreen-private.h
@@ -75,9 +75,6 @@ struct _CoglOnscreen
   void *winsys;
 };
 
-CoglOnscreen *
-_cogl_onscreen_new (void);
-
 COGL_EXPORT void
 _cogl_framebuffer_winsys_update_size (CoglFramebuffer *framebuffer,
                                       int width, int height);
diff --git a/cogl/cogl/cogl-onscreen.c b/cogl/cogl/cogl-onscreen.c
index ef996017ac..3b3f2585ba 100644
--- a/cogl/cogl/cogl-onscreen.c
+++ b/cogl/cogl/cogl-onscreen.c
@@ -87,35 +87,6 @@ _cogl_onscreen_init_from_template (CoglOnscreen *onscreen,
   cogl_object_ref (framebuffer->config.swap_chain);
 }
 
-/* XXX: While we still have backend in Clutter we need a dummy object
- * to represent the CoglOnscreen framebuffer that the backend
- * creates... */
-CoglOnscreen *
-_cogl_onscreen_new (void)
-{
-  g_autofree CoglOnscreen *onscreen_ptr = g_new0 (CoglOnscreen, 1);
-  CoglOnscreen *onscreen;
-
-  _COGL_GET_CONTEXT (ctx, NULL);
-
-  onscreen = g_steal_pointer (&onscreen_ptr);
-  _cogl_framebuffer_init (COGL_FRAMEBUFFER (onscreen),
-                          ctx,
-                          COGL_FRAMEBUFFER_TYPE_ONSCREEN,
-                          0x1eadbeef, /* width */
-                          0x1eadbeef); /* height */
-  /* NB: make sure to pass positive width/height numbers here
-   * because otherwise we'll hit input validation assertions!*/
-
-  _cogl_onscreen_init_from_template (onscreen, ctx->display->onscreen_template);
-
-  COGL_FRAMEBUFFER (onscreen)->allocated = TRUE;
-
-  /* XXX: Note we don't initialize onscreen->winsys in this case. */
-
-  return _cogl_onscreen_object_new (onscreen);
-}
-
 CoglOnscreen *
 cogl_onscreen_new (CoglContext *ctx, int width, int height)
 {