Make the constructor of a LayoutRect from an IntRect explicit.

Source/core/layout/HitTestLocation.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 56 matching lines @@
     bool intersects(const LayoutRect&) const;
     bool intersects(const FloatRect&) const;
     bool intersects(const FloatRoundedRect&) const;
     bool containsPoint(const FloatPoint&) const;
 
     const FloatPoint& transformedPoint() const { return m_transformedPoint; }
     const FloatQuad& transformedRect() const { return m_transformedRect; }
 
 private:
     template<typename RectType>
-    bool intersectsRect(const RectType&) const;
+    bool intersectsRect(const RectType&, const RectType& boundingBox) const;
     void move(const LayoutSize& offset);
 
     // This is cached forms of the more accurate point and area below.
     LayoutPoint m_point;
     IntRect m_boundingBox;
 
     FloatPoint m_transformedPoint;
     FloatQuad m_transformedRect;
 
     bool m_isRectBased;
     bool m_isRectilinear;
 };
 
 } // namespace blink
 
 #endif // HitTestLocation_h