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

ash/system/tray/tray_notification_view.h

Index: ash/system/tray/tray_notification_view.h
diff --git a/ash/system/tray/tray_notification_view.h b/ash/system/tray/tray_notification_view.h
deleted file mode 100644
index b6179abe55acac68f5aac52b6066dcb2c436f928..0000000000000000000000000000000000000000
--- a/ash/system/tray/tray_notification_view.h
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright (c) 2012 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_TRAY_TRAY_NOTIFICATION_VIEW_H_
-#define ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_
-
-#include "ui/views/view.h"
-
-namespace views {
-class ImageView;
-}
-
-namespace ash {
-
-// A view for closable notification views, laid out like:
-//  -------------------
-// | icon  contents  x |
-//  ----------------v--
-// The close button will call OnClose() when clicked.
-class TrayNotificationView : public views::View {
- public:
-  // If icon_id is 0, no icon image will be set.
-  explicit TrayNotificationView(int icon_id);
-  ~TrayNotificationView() override;
-
-  // InitView must be called once with the contents to be displayed.
-  void InitView(views::View* contents);
-
- private:
-  int icon_id_;
-  views::ImageView* icon_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayNotificationView);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_TRAY_TRAY_NOTIFICATION_VIEW_H_