Fix statics in NativeTheme*::instance() to avoid destruction post main

ui/gfx/native_theme_gtk.cc

 // Copyright (c) 2011 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/gfx/native_theme_gtk.h"
 
+#include "base/basictypes.h"
+
 namespace gfx {
 
 // static
 const NativeTheme* NativeTheme::instance() {
   return NativeThemeGtk::instance();
 }
 
 // static
 const NativeThemeGtk* NativeThemeGtk::instance() {
   CR_DEFINE_STATIC_LOCAL(NativeThemeGtk, s_native_theme, ());
   return &s_native_theme;
 }
 
 NativeThemeGtk::NativeThemeGtk() {
 }
 
 NativeThemeGtk::~NativeThemeGtk() {
 }
 
 }  // namespace gfx