Clean up forward declarations in Source/core/page

Source/core/page/SpatialNavigation.h

 /*
  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 11 matching lines @@
 #define SpatialNavigation_h
 
 #include "core/dom/Node.h"
 #include "core/page/FocusType.h"
 #include "platform/geometry/LayoutRect.h"
 
 #include <limits>
 
 namespace blink {
 
-class Element;
 class LocalFrame;
 class HTMLAreaElement;
 class HTMLFrameOwnerElement;
-class IntRect;
-class RenderObject;
 
 inline long long maxDistance()
 {
     return std::numeric_limits<long long>::max();
 }
 
 inline int fudgeFactor()
 {
     return 2;
 }
@@ skipping 94 matching lines @@
 Node* scrollableEnclosingBoxOrParentFrameForNodeInDirection(FocusType, Node*);
 LayoutRect nodeRectInAbsoluteCoordinates(Node*, bool ignoreBorder = false);
 LayoutRect frameRectInAbsoluteCoordinates(LocalFrame*);
 LayoutRect virtualRectForDirection(FocusType, const LayoutRect& startingRect, LayoutUnit width = 0);
 LayoutRect virtualRectForAreaElementAndDirection(HTMLAreaElement&, FocusType);
 HTMLFrameOwnerElement* frameOwnerElement(FocusCandidate&);
 
 } // namespace blink
 
 #endif // SpatialNavigation_h