services: Cleanup class/struct fwd declarations

services/ui/ws/focus_controller.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 SERVICES_UI_WS_FOCUS_CONTROLLER_H_
 #define SERVICES_UI_WS_FOCUS_CONTROLLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "services/ui/ws/server_window_drawn_tracker_observer.h"
 #include "services/ui/ws/server_window_tracker.h"
 
 namespace ui {
 
 namespace ws {
 
 class FocusControllerDelegate;
 class FocusControllerObserver;
 class ServerWindow;
 class ServerWindowDrawnTracker;
-struct WindowId;
 
 // Describes the source of the change.
 enum class FocusControllerChangeSource {
   EXPLICIT,
   DRAWN_STATE_CHANGED,
 };
 
 // Tracks the focused window. Focus is moved to another window when the drawn
 // state of the focused window changes.
 class FocusController : public ServerWindowDrawnTrackerObserver {
@@ skipping 61 matching lines @@
   std::unique_ptr<ServerWindowDrawnTracker> drawn_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(FocusController);
 };
 
 }  // namespace ws
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_FOCUS_CONTROLLER_H_