Factor more colors into NativeTheme.

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 183abf9b265d6dfb652aa6b4faa65dab9a531031..99e2bc4d34b8fd1ce96a56342fff6c7d8bdbdeff 100644
--- a/ui/gfx/native_theme_chromeos.h
+++ b/ui/gfx/native_theme_chromeos.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -25,8 +25,9 @@ class NativeThemeChromeos : public NativeThemeBase {
   virtual gfx::Size GetPartSize(Part part,
                                 State state,
                                 const ExtraParams& extra) const OVERRIDE;
+  virtual SkColor GetSystemColor(ColorId color_id) const OVERRIDE;
 
-  // NativeThemeLinux overrides
+  // NativeThemeBase overrides
   virtual void PaintScrollbarTrack(SkCanvas* canvas,
       Part part, State state,
       const ScrollbarTrackExtraParams& extra_params,