gl_surface_egl: ensure off and on screen surfaces use the same EGLConfig

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
index 09b5993fb8c9d61d79ea1ea3e8e3be72c2f4079b..2fabcd66a14905f2366bd4ea10f756aff56fe1a0 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
@@ -224,10 +224,6 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   void SerializeImageRepresentation(const gfx::ImageSkiaRep& rep,
                                     std::vector<unsigned long>* data);
 
-  // Returns an 8888 ARGB visual. Can return NULL if there is no matching
-  // visual on this display.
-  Visual* GetARGBVisual();
-
   // See comment for variable open_windows_.
   static std::list<XID>& open_windows();