cros: Move LockWindow from chrome to ash

chrome/browser/chromeos/login/ui/lock_window.h

-// Copyright 2014 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 CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOCK_WINDOW_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOCK_WINDOW_H_
-
-#include "base/macros.h"
-#include "ui/views/widget/widget.h"
-#include "ui/views/widget/widget_delegate.h"
-
-namespace views {
-class View;
-class Widget;
-}
-
-namespace chromeos {
-
-// Shows the widget for the lock screen.
-class LockWindow : public views::Widget, public views::WidgetDelegate {
- public:
-  LockWindow();
-  ~LockWindow() override;
-
- private:
-  // views::WidgetDelegate:
-  views::View* GetInitiallyFocusedView() override;
-  views::Widget* GetWidget() override;
-  const views::Widget* GetWidget() const override;
-
-  DISALLOW_COPY_AND_ASSIGN(LockWindow);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOCK_WINDOW_H_