Clean up forward declarations in Source/core/page

Source/core/page/AutoscrollController.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 #ifndef AutoscrollController_h
 #define AutoscrollController_h
 
 #include "platform/geometry/IntPoint.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
-class EventHandler;
 class LocalFrame;
 class FrameView;
 class Node;
 class Page;
 class PlatformMouseEvent;
 class RenderBox;
 class RenderObject;
 
 enum AutoscrollType {
     NoAutoscroll,
@@ skipping 39 matching lines @@
     IntPoint m_dragAndDropAutoscrollReferencePosition;
     double m_dragAndDropAutoscrollStartTime;
 #if OS(WIN)
     IntPoint m_panScrollStartPos;
 #endif
 };
 
 } // namespace blink
 
 #endif // AutoscrollController_h