Removes code using mus client lib

ui/views/mus/pointer_watcher_event_router.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 UI_VIEWS_MUS_POINTER_WATCHER_EVENT_ROUTER_H_
-#define UI_VIEWS_MUS_POINTER_WATCHER_EVENT_ROUTER_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "services/ui/public/cpp/window_tree_client_observer.h"
-#include "ui/views/mus/mus_export.h"
-
-namespace ui {
-class PointerEvent;
-class WindowTreeClient;
-}
-
-namespace views {
-
-class PointerWatcher;
-class PointerWatcherEventRouterTest;
-
-// PointerWatcherEventRouter is responsible for maintaining the list of
-// PointerWatchers and notifying appropriately. It is expected the owner of
-// PointerWatcherEventRouter is a WindowTreeClientDelegate and calls
-// OnPointerEventObserved().
-class VIEWS_MUS_EXPORT PointerWatcherEventRouter
-    : public NON_EXPORTED_BASE(ui::WindowTreeClientObserver) {
- public:
-  // Public solely for tests.
-  enum EventTypes {
-    // No PointerWatchers have been added.
-    NONE,
-
-    // Used when the only PointerWatchers added do not want moves.
-    NON_MOVE_EVENTS,
-
-    // Used when at least one PointerWatcher has been added that wants moves.
-    MOVE_EVENTS,
-  };
-
-  explicit PointerWatcherEventRouter(ui::WindowTreeClient* client);
-  ~PointerWatcherEventRouter() override;
-
-  // Called by WindowTreeClientDelegate to notify PointerWatchers appropriately.
-  void OnPointerEventObserved(const ui::PointerEvent& event,
-                              ui::Window* target);
-
-  void AddPointerWatcher(PointerWatcher* watcher, bool wants_moves);
-  void RemovePointerWatcher(PointerWatcher* watcher);
-
- private:
-  friend class PointerWatcherEventRouterTest;
-
-  // Determines EventTypes based on the number and type of PointerWatchers.
-  EventTypes DetermineEventTypes();
-
-  // ui::WindowTreeClientObserver:
-  void OnWindowTreeCaptureChanged(ui::Window* gained_capture,
-                                  ui::Window* lost_capture) override;
-  void OnDidDestroyClient(ui::WindowTreeClient* client) override;
-
-  ui::WindowTreeClient* window_tree_client_;
-  // The true parameter to ObserverList indicates the list must be empty on
-  // destruction. Two sets of observers are maintained, one for observers not
-  // needing moves |non_move_watchers_| and |move_watchers_| for those
-  // observers wanting moves too.
-  base::ObserverList<views::PointerWatcher, true> non_move_watchers_;
-  base::ObserverList<views::PointerWatcher, true> move_watchers_;
-
-  EventTypes event_types_ = EventTypes::NONE;
-
-  DISALLOW_COPY_AND_ASSIGN(PointerWatcherEventRouter);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_MUS_POINTER_WATCHER_EVENT_ROUTER_H_