Use a single views::MenuConfig instance for each platform

ui/views/controls/menu/menu_config_aura.cc

-// Copyright 2014 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 "ui/base/layout.h"
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/image/image.h"
-#include "ui/gfx/image/image_skia.h"
-#include "ui/native_theme/native_theme_aura.h"
-#include "ui/resources/grit/ui_resources.h"
-#include "ui/views/controls/menu/menu_image_util.h"
-#include "ui/views/resources/grit/views_resources.h"
-
-namespace views {
-
-namespace {
-#if defined(OS_CHROMEOS)
-static const int kMenuCornerRadiusForAura = 2;
-#else
-static const int kMenuCornerRadiusForAura = 0;
-#endif
-}  // namespace
-
-#if !defined(OS_WIN)
-void MenuConfig::Init(const ui::NativeTheme* theme) {
-  if (theme == ui::NativeThemeAura::instance())
-    InitAura(theme);
-}
-#endif
-
-void MenuConfig::InitAura(const ui::NativeTheme* theme) {
-  submenu_horizontal_inset = 1;
-  arrow_to_edge_padding = 20;
-  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-  arrow_width = rb.GetImageNamed(IDR_MENU_HIERARCHY_ARROW).Width();
-  gfx::ImageSkia check = GetMenuCheckImage(false);
-  check_height = check.height();
-  item_min_height = 29;
-  separator_spacing_height = 7;
-  separator_lower_height = 8;
-  separator_upper_height = 8;
-  label_to_arrow_padding = 20;
-  label_to_minor_text_padding = 20;
-  always_use_icon_to_label_padding = true;
-  align_arrow_and_shortcut = true;
-  offset_context_menus = true;
-  corner_radius = kMenuCornerRadiusForAura;
-
-  // In Ash, the border is provided by the shadow.
-  use_outer_border = false;
-}
-
-#if !defined(OS_WIN)
-// static
-const MenuConfig& MenuConfig::instance(const ui::NativeTheme* theme) {
-  CR_DEFINE_STATIC_LOCAL(MenuConfig, instance,
-                         (theme ? theme : ui::NativeThemeAura::instance()));
-  return instance;
-}
-#endif
-
-}  // namespace views