*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/rendering/HitTestLocation.h

Index: Source/core/rendering/HitTestLocation.h
diff --git a/Source/core/rendering/HitTestLocation.h b/Source/core/rendering/HitTestLocation.h
index 7edcd8e03bc57a46854bfa47f719439b11cb2d39..32d53718e3500e113b97d9d6fc63baaeb115b230 100644
--- a/Source/core/rendering/HitTestLocation.h
+++ b/Source/core/rendering/HitTestLocation.h
@@ -38,7 +38,6 @@ class Frame;
 class Image;
 class KURL;
 class Node;
-class RenderRegion;
 class Scrollbar;
 
 class HitTestLocation {
@@ -50,8 +49,8 @@ public:
     HitTestLocation(const FloatPoint&, const FloatQuad&);
     // Pass non-zero padding values to perform a rect-based hit test.
     HitTestLocation(const LayoutPoint& centerPoint, unsigned topPadding, unsigned rightPadding, unsigned bottomPadding, unsigned leftPadding);
-    // Make a copy the HitTestLocation in a new region by applying given offset to internal point and area.
-    HitTestLocation(const HitTestLocation&, const LayoutSize& offset, RenderRegion* = 0);
+    // FIXME: is copy + offset still used?
+    HitTestLocation(const HitTestLocation&, const LayoutSize& offset);
     HitTestLocation(const HitTestLocation&);
     ~HitTestLocation();
     HitTestLocation& operator=(const HitTestLocation&);
@@ -59,8 +58,6 @@ public:
     const LayoutPoint& point() const { return m_point; }
     IntPoint roundedPoint() const { return roundedIntPoint(m_point); }
 
-    RenderRegion* region() const { return m_region; }
-
     // Rect-based hit test related methods.
     bool isRectBasedTest() const { return m_isRectBased; }
     bool isRectilinear() const { return m_isRectilinear; }
@@ -91,8 +88,6 @@ private:
     FloatPoint m_transformedPoint;
     FloatQuad m_transformedRect;
 
-    RenderRegion* m_region; // The region we're inside.
-
     bool m_isRectBased;
     bool m_isRectilinear;
 };