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

ui/base/native_theme/native_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_GFX_NATIVE_THEME_H_
-#define UI_GFX_NATIVE_THEME_H_
+#ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_H_
+#define UI_BASE_NATIVE_THEME_NATIVE_THEME_H_
 #pragma once
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/ui_export.h"
 #include "ui/gfx/native_widget_types.h"
 
 class SkCanvas;
 
 namespace gfx {
-
 class Rect;
 class Size;
+}
+
+namespace ui {
 
 // This class supports drawing UI controls (like buttons, text fields, lists,
 // comboboxes, etc) that look like the native UI controls of the underlying
 // platform, such as Windows or Linux. It also supplies default colors for
 // dialog box backgrounds, etc., which are obtained from the system theme where
 // possible.
 //
 // The supported control types are listed in the Part enum.  These parts can be
 // in any state given by the State enum, where the actual definition of the
 // state is part-specific. The supported colors are listed in the ColorId enum.
@@ skipping 162 matching lines @@
     ProgressBarExtraParams progress_bar;
     ScrollbarArrowExtraParams scrollbar_arrow;
     ScrollbarTrackExtraParams scrollbar_track;
     ScrollbarThumbExtraParams scrollbar_thumb;
     SliderExtraParams slider;
     TextFieldExtraParams text_field;
     TrackbarExtraParams trackbar;
   };
 
   // Return the size of the part.
-  virtual Size GetPartSize(Part part,
-                           State state,
-                           const ExtraParams& extra) const = 0;
+  virtual gfx::Size GetPartSize(Part part,
+                                State state,
+                                const ExtraParams& extra) const = 0;
 
   // Paint the part to the canvas.
   virtual void Paint(SkCanvas* canvas,
                      Part part,
                      State state,
                      const gfx::Rect& rect,
                      const ExtraParams& extra) const = 0;
 
   // Supports theme specific colors.
   void SetScrollbarColors(unsigned inactive_color,
@@ skipping 45 matching lines @@
   NativeTheme() {}
   virtual ~NativeTheme() {}
 
   static unsigned int thumb_inactive_color_;
   static unsigned int thumb_active_color_;
   static unsigned int track_color_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTheme);
 };
 
-}  // namespace gfx
+}  // namespace ui
 
-#endif  // UI_GFX_NATIVE_THEME_H_
+#endif  // UI_BASE_NATIVE_THEME_NATIVE_THEME_H_