Revert "chromeos: Move files in //ash/common to //ash, part 3"

ash/system/cast/tray_cast.h

 // Copyright 2015 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_SYSTEM_CAST_TRAY_CAST_H_
 #define ASH_SYSTEM_CAST_TRAY_CAST_H_
 
 #include <string>
 #include <vector>
 
-#include "ash/cast_config_controller.h"
-#include "ash/shell_observer.h"
+#include "ash/common/cast_config_controller.h"
+#include "ash/common/shell_observer.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/macros.h"
 
 namespace ash {
 namespace tray {
 class CastTrayView;
 class CastDetailedView;
 class CastDuplexView;
 }  // namespace tray
 
@@ skipping 52 matching lines @@
   tray::CastTrayView* tray_ = nullptr;
   tray::CastDuplexView* default_ = nullptr;
   tray::CastDetailedView* detailed_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(TrayCast);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CAST_TRAY_CAST_H_