ui/gfx: Get rid of a few static variables from NativeTheme* type.

ui/gfx/native_theme_win.cc

Index: ui/gfx/native_theme_win.cc
diff --git a/ui/gfx/native_theme_win.cc b/ui/gfx/native_theme_win.cc
index 23a5e5012491c4a1b3882eaccdef34c3c72b641b..8b4ea1d71442c38aaafe0566d4bbf71eafbe13ff 100644
--- a/ui/gfx/native_theme_win.cc
+++ b/ui/gfx/native_theme_win.cc
@@ -9,6 +9,7 @@
 #include <vsstyle.h>
 #include <vssym32.h>
 
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/scoped_handle.h"
 #include "base/memory/scoped_ptr.h"
@@ -62,11 +63,12 @@ const NativeTheme* NativeTheme::instance() {
   return NativeThemeWin::instance();
 }
 
+static base::LazyInstance<NativeThemeWin> g_native_theme(
+    base::LINKER_INITIALIZED);
+
 // static
 const NativeThemeWin* NativeThemeWin::instance() {
-  // The global NativeThemeWin instance.
-  static const NativeThemeWin s_native_theme;
-  return &s_native_theme;
+  return g_native_theme.Pointer();
 }
 
 NativeThemeWin::NativeThemeWin()