Move Aura to UI subdir.

aura/aura_export.h

Index: aura/aura_export.h
===================================================================
--- aura/aura_export.h	(revision 100961)
+++ aura/aura_export.h	(working copy)
@@ -1,30 +0,0 @@
-// 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 AURA_AURA_EXPORT_H
-#define AURA_AURA_EXPORT_H
-#pragma once
-
-// Defines AURA_EXPORT so that functionality implemented by the aura module
-// can be exported to consumers.
-
-#if defined(COMPONENT_BUILD)
-#if defined(WIN32)
-
-#if defined(AURA_IMPLEMENTATION)
-#define AURA_EXPORT __declspec(dllexport)
-#else
-#define AURA_EXPORT __declspec(dllimport)
-#endif  // defined(AURA_IMPLEMENTATION)
-
-#else  // defined(WIN32)
-#define AURA_EXPORT __attribute__((visibility("default")))
-#endif
-
-#else  // defined(COMPONENT_BUILD)
-#define AURA_EXPORT
-#endif
-
-#endif  // AURA_AURA_EXPORT_H
-