Convert TrayEventFilter to wm common types

ash/sysui/container_delegate_mus.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_SYSUI_CONTAINER_DELEGATE_MUS_H_
-#define ASH_SYSUI_CONTAINER_DELEGATE_MUS_H_
-
-#include "ash/container_delegate.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace sysui {
-
-// The ContainerDelegate for mus ash.
-class ContainerDelegateMus : public ContainerDelegate {
- public:
-  ContainerDelegateMus();
-  ~ContainerDelegateMus() override;
-
-  // ContainerDelegate:
-  bool IsInMenuContainer(views::Widget* widget) override;
-  bool IsInStatusContainer(views::Widget* widget) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ContainerDelegateMus);
-};
-
-}  // namespace sysui
-}  // namespace ash
-
-#endif  // ASH_SYSUI_CONTAINER_DELEGATE_MUS_H_