Change name of NativeTheme::instance() to make it clear it's web only.

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"
@@ skipping 37 matching lines @@
   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) {
-  static MenuConfig* views_instance = NULL;
-  if (!views_instance)
-    views_instance = new MenuConfig(theme ?
-        theme : ui::NativeTheme::instance());
-  return *views_instance;
+  CR_DEFINE_STATIC_LOCAL(MenuConfig, instance,
+                         (theme ? theme : ui::NativeThemeAura::instance()));
+  return instance;
 }
 #endif
 
 }  // namespace views