athena: Move athena_export.h into common/ directory.

athena/home/public/app_model_builder.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_HOME_PUBLIC_APP_MODEL_BUILDER_H_
 #define ATHENA_HOME_PUBLIC_APP_MODEL_BUILDER_H_
 
-#include "athena/athena_export.h"
+#include "athena/common/athena_export.h"
 
 namespace app_list {
 class AppListModel;
 }  // namespace app_list
 
 namespace athena {
 
 // An interface to fill the list of apps in the home card.
 // TODO(mukai): integrate the interface with chrome/browser/ui/app_list/
 // extension_app_model_builder.
 class ATHENA_EXPORT AppModelBuilder {
  public:
   virtual ~AppModelBuilder() {}
 
   // Fills |model| with the currently available app_list::AppListItems.
   virtual void PopulateApps(app_list::AppListModel* model) = 0;
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_HOME_PUBLIC_APP_MODEL_BUILDER_H_