Revert of Support modal windows

athena/screen/screen_accelerator_handler.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_SCREEN_SCREEN_ACCELERATOR_HANDLER_H_
-#define ATHENA_SCREEN_SCREEN_ACCELERATOR_HANDLER_H_
 
 #include "athena/input/public/accelerator_manager.h"
 
 #include "base/macros.h"
 
 namespace aura {
 class Window;
 }
 
 namespace athena {
@@ skipping 10 matching lines @@
   virtual bool IsCommandEnabled(int command_id) const override;
   virtual bool OnAcceleratorFired(int command_id,
                                   const ui::Accelerator& accelerator) override;
 
   aura::Window* root_window_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenAcceleratorHandler);
 };
 
 }  // namespace athena
-
-#endif  // ATHENA_SCREEN_SCREEN_ACCELERATOR_HANDLER_H_