ash: Cleanup class/struct forward declarations

ash/autoclick/common/autoclick_controller_common.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 ASH_AUTOCLICK_COMMON_AUTOCLICK_CONTROLLER_COMMON_H
 #define ASH_AUTOCLICK_COMMON_AUTOCLICK_CONTROLLER_COMMON_H
 
 #include "ash/autoclick/common/autoclick_ring_handler.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace views {
 class Widget;
 }
 
 namespace ui {
 class MouseEvent;
 class KeyEvent;
-class TouchEvent;
-class GestureEvent;
-class ScrollEvent;
 }
 
 namespace ash {
 class AutoclickControllerCommonDelegate;
 
 // Autoclick is one of the accessibility features. If enabled, two circles will
 // animate at the mouse event location and an automatic click event will happen
 // after a certain amout of time at that location.
 // AutoclickControllerCommon is the common code for both ash and mus to handle
 // events and to manage autoclick time delay and timer.
@@ skipping 25 matching lines @@
   // the distance the mouse has moved.
   gfx::Point anchor_location_;
   std::unique_ptr<AutoclickRingHandler> autoclick_ring_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoclickControllerCommon);
 };
 
 }  // namespace ash
 
 #endif  // ASH_AUTOCLICK_COMMON_AUTOCLICK_CONTROLLER_COMMON_H