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

ash/common/system/tray/tray_notification_view.h

Index: ash/common/system/tray/tray_notification_view.h
diff --git a/ash/system/tray/tray_notification_view.h b/ash/common/system/tray/tray_notification_view.h
similarity index 83%
rename from ash/system/tray/tray_notification_view.h
rename to ash/common/system/tray/tray_notification_view.h
index b6179abe55acac68f5aac52b6066dcb2c436f928..58e29667e77c3572e6ea2e689eeb0bf240ce1b2c 100644
--- a/ash/system/tray/tray_notification_view.h
+++ b/ash/common/system/tray/tray_notification_view.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_
-#define ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_
+#define ASH_COMMON_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_
 
 #include "ui/views/view.h"
 
@@ -36,4 +36,4 @@ class TrayNotificationView : public views::View {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_