Use a single views::MenuConfig instance for each platform

ui/views/controls/menu/menu_config.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/menu/menu_config.h"
 
-#include "build/build_config.h"
+#include "base/macros.h"
 
 namespace views {
 
-MenuConfig::MenuConfig(const ui::NativeTheme* theme)
+MenuConfig::MenuConfig()
     : arrow_color(SK_ColorBLACK),
       menu_vertical_border_size(3),
       menu_horizontal_border_size(0),
       submenu_horizontal_inset(3),
       item_top_margin(4),
       item_bottom_margin(3),
       item_no_icon_top_margin(4),
       item_no_icon_bottom_margin(4),
       item_left_margin(10),
       label_to_arrow_padding(10),
@@ skipping 13 matching lines @@
       item_min_height(0),
       show_accelerators(true),
       always_use_icon_to_label_padding(false),
       align_arrow_and_shortcut(false),
       offset_context_menus(false),
       use_outer_border(true),
       icons_in_label(false),
       check_selected_combobox_item(false),
       show_delay(400),
       corner_radius(0) {
-  Init(theme);
+  Init();
 }
 
 MenuConfig::~MenuConfig() {}
 
+// static
+const MenuConfig& MenuConfig::instance() {
+  CR_DEFINE_STATIC_LOCAL(MenuConfig, instance, ());
+  return instance;
+}
+
 }  // namespace views