[mutter] backend: Remove meta_backend_get_ui_scaling_factor

[Rico Tzschichholz <ricotz src gnome org>]

commit 92e2242cf091ecaef37242c8d995eb86e925e63c
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Sep 26 17:38:05 2017 +0200

    backend: Remove meta_backend_get_ui_scaling_factor
    
    Forgotten in 2718699ccc9ad9511e228e91595e3fdf4c13621b
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788199

 src/meta/meta-backend.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/src/meta/meta-backend.h b/src/meta/meta-backend.h
index 50afa72..8db2360 100644
--- a/src/meta/meta-backend.h
+++ b/src/meta/meta-backend.h
@@ -48,8 +48,6 @@ void meta_backend_lock_layout_group (MetaBackend *backend,
 void meta_backend_set_numlock (MetaBackend *backend,
                                gboolean     numlock_state);
 
-int meta_backend_get_ui_scaling_factor (MetaBackend *backend);
-
 ClutterActor *meta_backend_get_stage (MetaBackend *backend);
 
 MetaDnd      *meta_backend_get_dnd   (MetaBackend *backend);