Reduce forward declarations in core/dom

Source/core/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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.
@@ skipping 31 matching lines @@
 class AXObject;
 class AXObjectCache;
 class Element;
 class LocalFrame;
 class FrameView;
 class HTMLAnchorElement;
 class HTMLAreaElement;
 class IntPoint;
 class IntSize;
 class Node;
+class Range;
 class RenderObject;
 class RenderListItem;
 class ScrollableArea;
 class VisibleSelection;
 class Widget;
 
 typedef unsigned AXID;
 
 enum AccessibilityRole {
     AlertDialogRole = 1,
@@ skipping 511 matching lines @@
 
     bool m_detached;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace WebCore
 
 #endif // AXObject_h