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

ui/gfx/native_theme_chromeos.cc

Index: ui/gfx/native_theme_chromeos.cc
diff --git a/ui/gfx/native_theme_chromeos.cc b/ui/gfx/native_theme_chromeos.cc
index a12b45f9eb8b43c3497a111e40f35d83079f7bb7..5c1fc11e0785df85e5f472d84b11620f71d820e2 100644
--- a/ui/gfx/native_theme_chromeos.cc
+++ b/ui/gfx/native_theme_chromeos.cc
@@ -4,12 +4,13 @@
 
 #include "ui/gfx/native_theme_chromeos.h"
 
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "grit/gfx_resources.h"
-#include "third_party/skia/include/effects/SkGradientShader.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkShader.h"
+#include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/rect.h"
@@ -230,11 +231,12 @@ void GetRadioIndicatorGradientPaint(const gfx::Rect bounds,
 
 }  // namespace
 
-/* static */
+base::LazyInstance<gfx::NativeThemeLinux> g_native_theme(
+    base::LINKER_INITIALIZED);
+
+// static
 const gfx::NativeThemeLinux* gfx::NativeThemeLinux::instance() {
-  // The global NativeThemeChromeos instance.
-  static NativeThemeChromeos s_native_theme;
-  return &s_native_theme;
+  return g_native_theme.Pointer();
 }
 
 NativeThemeChromeos::NativeThemeChromeos() {