Added MenuConfig setter to MenuItemView, updated rest of the code to use set MenuConfig if it avail…

ui/views/controls/menu/menu_config.h

Index: ui/views/controls/menu/menu_config.h
diff --git a/ui/views/controls/menu/menu_config.h b/ui/views/controls/menu/menu_config.h
index 32d26e76434514e163681b5e91b400bf640f2c98..a382d2bb4fb277e903e3b422372549fe03b15a7c 100644
--- a/ui/views/controls/menu/menu_config.h
+++ b/ui/views/controls/menu/menu_config.h
@@ -122,7 +122,7 @@ struct VIEWS_EXPORT MenuConfig {
   // True if the context menu's should be offset from the cursor position.
   bool offset_context_menus;
 
- private:
+ protected:
   // Creates and configures a new MenuConfig as appropriate for the current
   // platform.
   static MenuConfig* Create();