Refactor menu controller to isolate aura dependency.

ui/views/controls/menu/menu_config_mac.cc

Index: ui/views/controls/menu/menu_config_mac.cc
diff --git a/ui/views/controls/menu/menu_config_mac.cc b/ui/views/controls/menu/menu_config_mac.cc
index fdd7de9da297ce9db37d60baa32e35a3bc0f50a7..dd38e72fe7e2bed06fbca22a0409951f01589b70 100644
--- a/ui/views/controls/menu/menu_config_mac.cc
+++ b/ui/views/controls/menu/menu_config_mac.cc
@@ -4,10 +4,23 @@
 
 #include "ui/views/controls/menu/menu_config.h"
 
+#include "grit/ui_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/native_theme/native_theme_mac.h"
+#include "ui/views/controls/menu/menu_image_util.h"
+
 namespace views {
 
 void MenuConfig::Init(const ui::NativeTheme* theme) {
   NOTIMPLEMENTED();
 }
 
+// static
+const MenuConfig& MenuConfig::instance(const ui::NativeTheme* theme) {
+  CR_DEFINE_STATIC_LOCAL(
+      MenuConfig, mac_instance, (theme ? theme : ui::NativeTheme::instance()));
+  return mac_instance;
+}
+
 }  // namespace views