ui: Cleanup class/struct forward declarations

ui/views/mus/window_manager_connection.h

 // Copyright 2015 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_WINDOW_MANAGER_CONNECTION_H_
 #define UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 13 matching lines @@
 namespace service_manager {
 class Connector;
 }
 
 namespace ui {
 class GpuService;
 }
 
 namespace views {
 class NativeWidget;
-class PointerWatcher;
 class PointerWatcherEventRouter;
 class ScreenMus;
 class SurfaceContextFactory;
 namespace internal {
 class NativeWidgetDelegate;
 }
 
 namespace test {
 class WindowManagerConnectionTestApi;
 }
@@ skipping 73 matching lines @@
   std::unique_ptr<ui::GpuService> gpu_service_;
   std::unique_ptr<PointerWatcherEventRouter> pointer_watcher_event_router_;
   std::unique_ptr<SurfaceContextFactory> compositor_context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerConnection);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_WINDOW_MANAGER_CONNECTION_H_