Moves mash/wm into ash/mus

mash/wm/drag_window_resizer.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 MASH_WM_DRAG_WINDOW_RESIZER_H_
-#define MASH_WM_DRAG_WINDOW_RESIZER_H_
-
-#include <memory>
-
-#include "ash/common/wm/window_resizer.h"
-#include "base/macros.h"
-
-namespace mash {
-namespace wm {
-
-// DragWindowResizer is a decorator of WindowResizer and adds the ability to
-// drag windows across displays.
-class DragWindowResizer : public ash::WindowResizer {
- public:
-  DragWindowResizer(std::unique_ptr<WindowResizer> next_window_resizer,
-                    ash::wm::WindowState* window_state);
-  ~DragWindowResizer() override;
-
-  // WindowResizer:
-  void Drag(const gfx::Point& location, int event_flags) override;
-  void CompleteDrag() override;
-  void RevertDrag() override;
-
- private:
-  std::unique_ptr<ash::WindowResizer> next_window_resizer_;
-
-  DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
-};
-
-}  // namespace wm
-}  // namespace mash
-
-#endif  // MASH_WM_DRAG_WINDOW_RESIZER_H_