Move Aura to UI subdir.

aura/focus_manager.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 AURA_FOCUS_MANAGER_H_
-#define AURA_FOCUS_MANAGER_H_
-#pragma once
-
-#include "base/basictypes.h"
-
-namespace aura {
-class Window;
-
-namespace internal {
-
-// The FocusManager, when attached to a Window, tracks changes to keyboard input
-// focus within that Window's hierarchy.
-class FocusManager {
- public:
-  explicit FocusManager(Window* owner);
-  ~FocusManager();
-
-  void SetFocusedWindow(Window* window);
-
-  Window* focused_window() { return focused_window_; }
-
- private:
-  Window* owner_;
-  Window* focused_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(FocusManager);
-};
-
-}  // namespace internal
-}  // namespace aura
-
-#endif  // AURA_FOCUS_MANAGER_H_