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

ui/gfx/native_theme_chromeos.h

Index: ui/gfx/native_theme_chromeos.h
diff --git a/ui/gfx/native_theme_chromeos.h b/ui/gfx/native_theme_chromeos.h
index 1e1b84f5d83cc96f5da6ee2bd10755a36ca58344..058d474f655d6305efe01950d8e5c9b104aa6b89 100644
--- a/ui/gfx/native_theme_chromeos.h
+++ b/ui/gfx/native_theme_chromeos.h
@@ -4,19 +4,23 @@
 
 #ifndef UI_GFX_NATIVE_THEME_CHROMEOS_H_
 #define UI_GFX_NATIVE_THEME_CHROMEOS_H_
+#pragma once
 
 #include <map>
+
 #include "base/compiler_specific.h"
 #include "ui/gfx/native_theme_linux.h"
 
 class SkBitmap;
 
 class NativeThemeChromeos : public gfx::NativeThemeLinux {
- private:
-  friend class NativeThemeLinux;
+ public:
   NativeThemeChromeos();
   virtual ~NativeThemeChromeos();
 
+ private:
+  friend class NativeThemeLinux;
+
   // NativeTheme overrides
   virtual gfx::Size GetPartSize(Part part,
                                 State state,