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

ui/base/native_theme/native_theme_aura.h

Index: ui/base/native_theme/native_theme_aura.h
diff --git a/ui/gfx/native_theme_aura.h b/ui/base/native_theme/native_theme_aura.h
similarity index 85%
rename from ui/gfx/native_theme_aura.h
rename to ui/base/native_theme/native_theme_aura.h
index de4b10dc404af70c4c096e30633a1af3c848e2a1..077a42a369dd4370c7e2e95e84c33674aba9707e 100644
--- a/ui/gfx/native_theme_aura.h
+++ b/ui/base/native_theme/native_theme_aura.h
@@ -2,15 +2,15 @@
 // 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_
+#ifndef UI_BASE_NATIVE_THEME_NATIVE_THEME_AURA_H_
+#define UI_BASE_NATIVE_THEME_NATIVE_THEME_AURA_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
-#include "ui/gfx/native_theme_base.h"
+#include "ui/base/native_theme/native_theme_base.h"
 
-namespace gfx {
+namespace ui {
 
 // Aura implementation of native theme support.
 class NativeThemeAura : public NativeThemeBase {
@@ -43,6 +43,6 @@ class NativeThemeAura : public NativeThemeBase {
   DISALLOW_COPY_AND_ASSIGN(NativeThemeAura);
 };
 
-}  // namespace gfx
+}  // namespace ui
 
-#endif  // UI_GFX_NATIVE_THEME_AURA_H_
+#endif  // UI_BASE_NATIVE_THEME_NATIVE_THEME_AURA_H_