Move mus to //services/ui

components/mus/ws/window_manager_window_tree_factory_set_observer.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 COMPONENTS_MUS_WS_WINDOW_MANAGER_WINDOW_TREE_FACTORY_SET_OBSERVER_H_
-#define COMPONENTS_MUS_WS_WINDOW_MANAGER_WINDOW_TREE_FACTORY_SET_OBSERVER_H_
-
-namespace mus {
-namespace ws {
-
-class WindowManagerWindowTreeFactory;
-
-class WindowManagerWindowTreeFactorySetObserver {
- public:
-  // Called when the WindowTree associated with |factory| has been set
-  virtual void OnWindowManagerWindowTreeFactoryReady(
-      WindowManagerWindowTreeFactory* factory) = 0;
-
- protected:
-  virtual ~WindowManagerWindowTreeFactorySetObserver() {}
-};
-
-}  // namespace ws
-}  // namespace mus
-
-#endif  // COMPONENTS_MUS_WS_WINDOW_MANAGER_WINDOW_TREE_FACTORY_SET_OBSERVER_H_