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

ui/gfx/native_theme_win.h

 // 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.
 //
 // A wrapper class for working with custom XP/Vista themes provided in
 // uxtheme.dll.  This is a singleton class that can be grabbed using
 // NativeThemeWin::instance().
 // For more information on visual style parts and states, see:
 // http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/userex/topics/partsandstates.asp
 
@@ skipping 30 matching lines @@
     STATUS,
     TAB,
     TEXTFIELD,
     TRACKBAR,
     WINDOW,
     PROGRESS,
     SPIN,
     LAST
   };
 
+  NativeThemeWin();
+  virtual ~NativeThemeWin();
+
   bool IsThemingActive() const;
 
   HRESULT GetThemeColor(ThemeName theme,
                         int part_id,
                         int state_id,
                         int prop_id,
                         SkColor* color) const;
 
   // Get the theme color if theming is enabled.  If theming is unsupported
   // for this part, use Win32's GetSysColor to find the color specified
@@ skipping 29 matching lines @@
   HRESULT PaintTextField(HDC hdc,
                          int part_id,
                          int state_id,
                          int classic_state,
                          RECT* rect,
                          COLORREF color,
                          bool fill_content_area,
                          bool draw_edges) const;
 
  private:
-  NativeThemeWin();
-  ~NativeThemeWin();
-
   // NativeTheme Implementation:
   virtual gfx::Size GetPartSize(Part part,
                                 State state,
                                 const ExtraParams& extra) const;
   virtual void Paint(SkCanvas* canvas,
                      Part part,
                      State state,
                      const gfx::Rect& rect,
                      const ExtraParams& extra) const;
 
@@ skipping 207 matching lines @@
 
   // A cache of open theme handles.
   mutable HANDLE theme_handles_[LAST];
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeWin);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_THEME_WIN_H_