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

ui/views/examples/native_theme_checkbox_example.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.
 
 #ifndef UI_VIEWS_EXAMPLES_NATIVE_THEME_CHECKBOX_EXAMPLE_H_
 #define UI_VIEWS_EXAMPLES_NATIVE_THEME_CHECKBOX_EXAMPLE_H_
 #pragma once
 
 #include "base/basictypes.h"
-#include "ui/gfx/native_theme.h"
+#include "ui/base/native_theme/native_theme.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/examples/example_base.h"
 
 namespace views {
 class Checkbox;
 
 namespace examples {
 
 // NativeThemeCheckboxExample exercises a Checkbox control.
 class NativeThemeCheckboxExample : public ExampleBase, public ButtonListener {
@@ skipping 13 matching lines @@
 
   int count_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeCheckboxExample);
 };
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_NATIVE_THEME_CHECKBOX_EXAMPLE_H_