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

ash/system/tiles/tray_tiles.h

Index: ash/system/tiles/tray_tiles.h
diff --git a/ash/system/tiles/tray_tiles.h b/ash/system/tiles/tray_tiles.h
deleted file mode 100644
index a1c1f629e69639867808440112c30106ffe47edc..0000000000000000000000000000000000000000
--- a/ash/system/tiles/tray_tiles.h
+++ /dev/null
@@ -1,44 +0,0 @@
-// Copyright 2016 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_TILES_TRAY_TILES_H_
-#define ASH_SYSTEM_TILES_TRAY_TILES_H_
-
-#include "ash/ash_export.h"
-#include "ash/system/tray/system_tray_item.h"
-#include "base/macros.h"
-
-namespace ash {
-class SystemTray;
-class TilesDefaultView;
-
-// The tray item for the 'tiles' at the bottom of the system menu. Each tile is
-// an image button which does not reqire explanatory text, and thus does not
-// require its own dedicated row in the system menu.
-class ASH_EXPORT TrayTiles : public SystemTrayItem {
- public:
-  explicit TrayTiles(SystemTray* system_tray);
-  ~TrayTiles() override;
-
-  // Accessor needed to obtain the help button view for the first-run flow.
-  views::View* GetHelpButtonView() const;
-
-  TilesDefaultView* GetDefaultViewForTesting() const;
-  views::View* CreateDefaultViewForTesting(LoginStatus status);
-
- private:
-  friend class TrayTilesTest;
-
-  // SystemTrayItem:
-  views::View* CreateDefaultView(LoginStatus status) override;
-  void DestroyDefaultView() override;
-
-  TilesDefaultView* default_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayTiles);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_TILES_TRAY_TILES_H_