ash: Cleanup class/struct forward declarations

ash/common/wm/window_cycle_list.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 ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_
 #define ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_
 
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/common/wm/window_cycle_controller.h"
 #include "ash/common/wm_window_observer.h"
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "base/timer/timer.h"
 #include "ui/display/display_observer.h"
 
 namespace display {
 class Screen;
 }
 
 namespace views {
-class Label;
 class Widget;
 }
 
 namespace ash {
 
 class ScopedShowWindow;
 class WindowCycleView;
 
 // Tracks a set of Windows that can be stepped through. This class is used by
 // the WindowCycleController.
@@ skipping 67 matching lines @@
 
   // A timer to delay showing the UI. Quick Alt+Tab should not flash a UI.
   base::OneShotTimer show_ui_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowCycleList);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_