Revert "chromeos: Move files in //ash/common to //ash, part 1"

ash/common/system/web_notification/web_notification_tray.h

Index: ash/common/system/web_notification/web_notification_tray.h
diff --git a/ash/system/web_notification/web_notification_tray.h b/ash/common/system/web_notification/web_notification_tray.h
similarity index 96%
rename from ash/system/web_notification/web_notification_tray.h
rename to ash/common/system/web_notification/web_notification_tray.h
index da07447df81a76f20686e63b877e36811ab97e12..ce64dd8ac6342628c87d995fa7173a00d02e1ba6 100644
--- a/ash/system/web_notification/web_notification_tray.h
+++ b/ash/common/system/web_notification/web_notification_tray.h
@@ -2,14 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
-#define ASH_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
+#ifndef ASH_COMMON_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
+#define ASH_COMMON_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/login_status.h"
-#include "ash/system/tray/tray_background_view.h"
+#include "ash/common/system/tray/tray_background_view.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ -187,4 +187,4 @@ class ASH_EXPORT WebNotificationTray
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_
+#endif  // ASH_COMMON_SYSTEM_WEB_NOTIFICATION_WEB_NOTIFICATION_TRAY_H_