Remove old activation code and disable-focus-controller flags

ash/wm/activation_controller_delegate.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 ASH_WM_ACTIVATION_CONTROLLER_DELEGATE_H_
-#define ASH_WM_ACTIVATION_CONTROLLER_DELEGATE_H_
-
-#include "ash/ash_export.h"
-
-namespace aura {
-class Window;
-}
-
-namespace ash {
-namespace internal {
-
-class ASH_EXPORT ActivationControllerDelegate {
- public:
-  virtual ~ActivationControllerDelegate() {}
-
-  // Called when the ActivationController is about to activate |window|. The
-  // delegate gets an opportunity to take action and modify activation.
-  // Modification occurs via the return value:
-  // Returning |window| will activate |window|.
-  // Returning some other window will activate that window instead.
-  // Returning NULL will not change activation.
-  virtual aura::Window* WillActivateWindow(aura::Window* window) = 0;
-
-  // Called when the ActivationController is about to focus |window|. Returns
-  // the window that should be focused instead.
-  virtual aura::Window* WillFocusWindow(aura::Window* window) = 0;
-};
-
-}  // namespace internal
-}  // namespace ash
-
-#endif  // ASH_WM_ACTIVATION_CONTROLLER_DELEGATE_H_