mash: Move system tray cast code into //ash/common

ash/common/system/chromeos/screen_security/screen_share_tray_item.h

 // Copyright 2013 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_CHROMEOS_SCREEN_SHARE_SCREEN_SHARE_TRAY_ITEM_H_
-#define ASH_SYSTEM_CHROMEOS_SCREEN_SHARE_SCREEN_SHARE_TRAY_ITEM_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_SHARE_TRAY_ITEM_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_SHARE_TRAY_ITEM_H_
 
 #include "ash/common/system/chromeos/screen_security/screen_share_observer.h"
-#include "ash/system/chromeos/screen_security/screen_tray_item.h"
+#include "ash/common/system/chromeos/screen_security/screen_tray_item.h"
 #include "base/macros.h"
 
 namespace views {
 class View;
 }
 
 namespace ash {
 
 class ASH_EXPORT ScreenShareTrayItem : public ScreenTrayItem,
                                        public ScreenShareObserver {
@@ skipping 15 matching lines @@
                           const base::string16& helper_name) override;
   void OnScreenShareStop() override;
 
   base::string16 helper_name_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenShareTrayItem);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_CHROMEOS_SCREEN_SHARE_SCREEN_SHARE_TRAY_ITEM_H_
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_SCREEN_SECURITY_SCREEN_SHARE_TRAY_ITEM_H_