It is time.

ui/wm/public/transient_window_client.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 UI_WM_PUBLIC_TRANSIENT_WINDOW_CLIENT_H_
-#define UI_WM_PUBLIC_TRANSIENT_WINDOW_CLIENT_H_
-
-#include "base/basictypes.h"
-#include "ui/aura/aura_export.h"
-
-namespace aura {
-
-class Window;
-
-namespace client {
-
-// TransientWindowClient is used to add or remove transient windows. Transient
-// children get the following behavior:
-// . The transient parent destroys any transient children when it is
-//   destroyed. This means a transient child is destroyed if either its parent
-//   or transient parent is destroyed.
-// . If a transient child and its transient parent share the same parent, then
-//   transient children are always ordered above the transient parent.
-// Transient windows are typically used for popups and menus.
-// TODO(sky): nuke this class and replace with calls to TransientWindowManager.
-// This is temporary until we start moving to ui/wm.
-class AURA_EXPORT TransientWindowClient {
- public:
-  virtual void AddTransientChild(Window* parent, Window* child) = 0;
-  virtual void RemoveTransientChild(Window* parent, Window* child) = 0;
-  virtual Window* GetTransientParent(Window* window) = 0;
-  virtual const Window* GetTransientParent(const Window* window) = 0;
-
- protected:
-  virtual ~TransientWindowClient() {}
-};
-
-// Sets/gets the TransientWindowClient. This does *not* take ownership of
-// |client|. It is assumed the caller will invoke SetTransientWindowClient(NULL)
-// before deleting |client|.
-AURA_EXPORT void SetTransientWindowClient(TransientWindowClient* client);
-AURA_EXPORT TransientWindowClient* GetTransientWindowClient();
-
-}  // namespace client
-}  // namespace aura
-
-#endif  // UI_WM_PUBLIC_TRANSIENT_WINDOW_CLIENT_H_