[gtk/wip/chergert/quartz4u] macos: remove dead code

[Christian Hergert <chergert src gnome org>]

commit 9d289466cdb64de4252b065e8fcb4eaf0ebbc4d0
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 5 18:09:22 2020 -0700

    macos: remove dead code

 gdk/macos/gdkmacoscairocontext.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/gdk/macos/gdkmacoscairocontext.c b/gdk/macos/gdkmacoscairocontext.c
index 3cdfce078f..4852159614 100644
--- a/gdk/macos/gdkmacoscairocontext.c
+++ b/gdk/macos/gdkmacoscairocontext.c
@@ -46,7 +46,6 @@ static cairo_surface_t *
 create_cairo_surface_for_surface (GdkSurface *surface)
 {
   cairo_surface_t *cairo_surface;
-  CGContextRef cg;
   GdkDisplay *display;
   int scale;
   int width;
@@ -54,7 +53,6 @@ create_cairo_surface_for_surface (GdkSurface *surface)
 
   g_assert (GDK_IS_MACOS_SURFACE (surface));
 
-  cg = NSGraphicsContext.currentContext.CGContext;
   display = gdk_surface_get_display (surface);
   scale = gdk_surface_get_scale_factor (surface);
   width = scale * gdk_surface_get_width (surface);