Move theme part drawing functions only used on Windows to NativeThemeWin

ui/native_theme/common_theme.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_NATIVE_THEME_COMMON_THEME_H_
 #define UI_NATIVE_THEME_COMMON_THEME_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/native_theme/native_theme.h"
 
@@ skipping 15 matching lines @@
 
 gfx::Size NATIVE_THEME_EXPORT CommonThemeGetPartSize(
     NativeTheme::Part part,
     NativeTheme::State state,
     const NativeTheme::ExtraParams& extra);
 
 void NATIVE_THEME_EXPORT CommonThemePaintComboboxArrow(
     SkCanvas* canvas,
     const gfx::Rect& rect);
 
-void NATIVE_THEME_EXPORT
-    CommonThemePaintMenuSeparator(SkCanvas* canvas, const gfx::Rect& rect);
-
-void NATIVE_THEME_EXPORT CommonThemePaintMenuGutter(SkCanvas* canvas,
-                                                    const gfx::Rect& rect);
-
-void NATIVE_THEME_EXPORT CommonThemePaintMenuBackground(SkCanvas* canvas,
-                                                        const gfx::Rect& rect);
-
 void NATIVE_THEME_EXPORT CommonThemePaintMenuItemBackground(
+    const NativeTheme* theme,
     SkCanvas* canvas,
     NativeTheme::State state,
     const gfx::Rect& rect,
     const NativeTheme::MenuItemExtraParams& menu_item);
 
 // Creates a gfx::Canvas wrapping an SkCanvas.
 scoped_ptr<gfx::Canvas> NATIVE_THEME_EXPORT CommonThemeCreateCanvas(
     SkCanvas* sk_canvas);
 
 }  // namespace ui
 
 #endif  // UI_NATIVE_THEME_COMMON_THEME_H_