mash: Move SystemTrayImage and TrayImageItem to //ash/common

ash/system/tray/tray_image_item.h

Index: ash/system/tray/tray_image_item.h
diff --git a/ash/system/tray/tray_image_item.h b/ash/system/tray/tray_image_item.h
deleted file mode 100644
index 220924c3f33024ea1057413112e494df3bd1e96e..0000000000000000000000000000000000000000
--- a/ash/system/tray/tray_image_item.h
+++ /dev/null
@@ -1,54 +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_IMAGE_ITEM_H_
-#define ASH_SYSTEM_TRAY_TRAY_IMAGE_ITEM_H_
-
-#include "ash/ash_export.h"
-#include "ash/system/tray/system_tray_item.h"
-#include "base/macros.h"
-
-namespace views {
-class ImageView;
-}
-
-namespace ash {
-class TrayItemView;
-
-class ASH_EXPORT TrayImageItem : public SystemTrayItem {
- public:
-  TrayImageItem(SystemTray* system_tray, int resource_id);
-  ~TrayImageItem() override;
-
-  views::View* tray_view();
-
-  // Changes the icon of the tray-view to the specified resource.
-  void SetImageFromResourceId(int resource_id);
-
- protected:
-  virtual bool GetInitialVisibility() = 0;
-
-  // Overridden from SystemTrayItem.
-  views::View* CreateTrayView(LoginStatus status) override;
-  views::View* CreateDefaultView(LoginStatus status) override;
-  views::View* CreateDetailedView(LoginStatus status) override;
-  void DestroyTrayView() override;
-  void DestroyDefaultView() override;
-  void DestroyDetailedView() override;
-  void UpdateAfterLoginStatusChange(LoginStatus status) override;
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
-
- private:
-  // Set the alignment of the image depending on the shelf alignment.
-  void SetItemAlignment(ShelfAlignment alignment);
-
-  int resource_id_;
-  TrayItemView* tray_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayImageItem);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_TRAY_TRAY_IMAGE_ITEM_H_