Factor more colors into NativeTheme.

ui/gfx/native_theme_base.h

Index: ui/gfx/native_theme_base.h
diff --git a/ui/gfx/native_theme_base.h b/ui/gfx/native_theme_base.h
index 3e0850b6b68758e3f9a321fca0c9f2ef0ee98757..413eb087547f68959708502ae379047298e5e75a 100644
--- a/ui/gfx/native_theme_base.h
+++ b/ui/gfx/native_theme_base.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.
 
@@ -26,7 +26,6 @@ class NativeThemeBase : public NativeTheme {
                      State state,
                      const gfx::Rect& rect,
                      const ExtraParams& extra) const OVERRIDE;
-  virtual SkColor GetSystemColor(ColorId color_id) const OVERRIDE;
 
  protected:
   NativeThemeBase();