Delete athena/

athena/activity/public/activity_manager_observer.h

-// Copyright 2014 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 ATHENA_ACTIVITY_PUBLIC_ACTIVITY_MANAGER_OBSERVER_H_
-#define ATHENA_ACTIVITY_PUBLIC_ACTIVITY_MANAGER_OBSERVER_H_
-
-#include "athena/athena_export.h"
-
-namespace athena {
-
-class Activity;
-
-class ATHENA_EXPORT ActivityManagerObserver {
- public:
-  virtual ~ActivityManagerObserver() {}
-
-  // Called after an |activity| got created.
-  virtual void OnActivityStarted(Activity* activity) = 0;
-
-  // Called before an |activity| gets destroyed.
-  virtual void OnActivityEnding(Activity* activity) = 0;
-
-  // Called when the order of the activities in the list has changed.
-  virtual void OnActivityOrderChanged() = 0;
-};
-
-}  // namespace athena
-
-#endif  // ATHENA_ACTIVITY_PUBLIC_ACTIVITY_MANAGER_OBSERVER_H_