ui: Move NativeTheme files into ui/base/native_theme/ directory.

ui/gfx/native_theme_aura.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_GFX_NATIVE_THEME_AURA_H_
-#define UI_GFX_NATIVE_THEME_AURA_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "ui/gfx/native_theme_base.h"
-
-namespace gfx {
-
-// Aura implementation of native theme support.
-class NativeThemeAura : public NativeThemeBase {
- public:
-  static const NativeThemeAura* instance();
-
- private:
-  NativeThemeAura();
-  virtual ~NativeThemeAura();
-
-  // Overridden from NativeThemeBase:
-  virtual SkColor GetSystemColor(ColorId color_id) const OVERRIDE;
-  virtual void PaintMenuPopupBackground(SkCanvas* canvas,
-                                        const gfx::Size& size) const OVERRIDE;
-  virtual void PaintScrollbarTrack(
-      SkCanvas* canvas,
-      Part part,
-      State state,
-      const ScrollbarTrackExtraParams& extra_params,
-      const gfx::Rect& rect) const OVERRIDE;
-  virtual void PaintArrowButton(SkCanvas* canvas,
-                                const gfx::Rect& rect,
-                                Part direction,
-                                State state) const OVERRIDE;
-  virtual void PaintScrollbarThumb(SkCanvas* canvas,
-                                   Part part,
-                                   State state,
-                                   const gfx::Rect& rect) const OVERRIDE;
-
-  DISALLOW_COPY_AND_ASSIGN(NativeThemeAura);
-};
-
-}  // namespace gfx
-
-#endif  // UI_GFX_NATIVE_THEME_AURA_H_