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

ash/system/palette/tools/magnifier_mode.h

-// 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_PALETTE_TOOLS_MAGNIFIER_MODE_H_
-#define ASH_SYSTEM_PALETTE_TOOLS_MAGNIFIER_MODE_H_
-
-#include "ash/system/palette/common_palette_tool.h"
-
-namespace ash {
-
-// Exposes a palette tool that lets the user enable a partial screen magnifier
-// (ie, a spyglass) that dynamically appears when pressing the screen.
-class MagnifierMode : public CommonPaletteTool {
- public:
-  explicit MagnifierMode(Delegate* delegate);
-  ~MagnifierMode() override;
-
- private:
-  // PaletteTool overrides.
-  PaletteGroup GetGroup() const override;
-  PaletteToolId GetToolId() const override;
-  const gfx::VectorIcon& GetActiveTrayIcon() const override;
-  void OnEnable() override;
-  void OnDisable() override;
-  views::View* CreateView() override;
-
-  // CommonPaletteTool overrides.
-  const gfx::VectorIcon& GetPaletteIcon() const override;
-
-  DISALLOW_COPY_AND_ASSIGN(MagnifierMode);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_PALETTE_TOOLS_MAGNIFIER_MODE_H_