mash: Convert system tray logout button to wm common types

ash/system/chromeos/label_tray_view.h

-// 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_CHROMEOS_LABEL_TRAY_VIEW_H_
-#define ASH_SYSTEM_CHROMEOS_LABEL_TRAY_VIEW_H_
-
-#include "base/macros.h"
-#include "base/strings/string16.h"
-#include "ui/views/view.h"
-
-namespace ash {
-
-class ViewClickListener;
-
-// View for simple information in tray. Automatically hides when message is
-// empty. Supports multiline messages.
-
-class LabelTrayView : public views::View {
- public:
-  LabelTrayView(ViewClickListener* click_listener, int icon_resource_id);
-  ~LabelTrayView() override;
-  void SetMessage(const base::string16& message);
-
- private:
-  views::View* CreateChildView(const base::string16& message) const;
-
-  ViewClickListener* click_listener_;
-  int icon_resource_id_;
-  base::string16 message_;
-
-  DISALLOW_COPY_AND_ASSIGN(LabelTrayView);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_CHROMEOS_LABEL_TRAY_VIEW_H_