Convert TrayEventFilter to wm common types

ash/container_delegate.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_CONTAINER_DELEGATE_H_
-#define ASH_CONTAINER_DELEGATE_H_
-
-#include "ash/ash_export.h"
-
-namespace views {
-class Widget;
-}
-
-namespace ash {
-
-// Allows access to the window container hierarchy, which differs between
-// classic ash (where ash itself manages the hierarchy) and mus (where the
-// window manager manages the hierarchy).
-class ASH_EXPORT ContainerDelegate {
- public:
-  virtual ~ContainerDelegate() {}
-
-  virtual bool IsInMenuContainer(views::Widget* widget) = 0;
-  virtual bool IsInStatusContainer(views::Widget* widget) = 0;
-};
-
-}  // namespace ash
-
-#endif  // ASH_CONTAINER_DELEGATE_H_