athena: Move athena_export.h into common/ directory.

athena/activity/public/activity_view_manager.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_VIEW_MANAGER_H_
 #define ATHENA_ACTIVITY_PUBLIC_ACTIVITY_VIEW_MANAGER_H_
 
-#include "athena/athena_export.h"
+#include "athena/common/athena_export.h"
 
 namespace athena {
 
 class Activity;
 
 // Manages the views for the activities.
 class ATHENA_EXPORT ActivityViewManager {
  public:
   static ActivityViewManager* Create();
   static ActivityViewManager* Get();
   static void Shutdown();
 
   virtual ~ActivityViewManager() {}
 
   // Adds/Removes a task.
   virtual void AddActivity(Activity* task) = 0;
   virtual void RemoveActivity(Activity* task) = 0;
 
   // Updates the UI when the task color/title changes.
   virtual void UpdateActivity(Activity* task) = 0;
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_ACTIVITY_PUBLIC_ACTIVITY_VIEW_MANAGER_H_