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

Source/core/rendering/RenderLayerClipper.h

Index: Source/core/rendering/RenderLayerClipper.h
diff --git a/Source/core/rendering/RenderLayerClipper.h b/Source/core/rendering/RenderLayerClipper.h
index 53ba1ae29dec93b1e6c3ae5d5f269ff21ef262d5..8cbffbff553de6b5f3d8446ddfdc2a529dbb123e 100644
--- a/Source/core/rendering/RenderLayerClipper.h
+++ b/Source/core/rendering/RenderLayerClipper.h
@@ -51,19 +51,16 @@
 namespace WebCore {
 
 class RenderLayer;
-class RenderRegion;
 
 struct ClipRectsContext {
-    ClipRectsContext(const RenderLayer* inRootLayer, RenderRegion* inRegion, ClipRectsType inClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip inRespectOverflowClip = RespectOverflowClip, const LayoutSize& inSubPixelAccumulation = LayoutSize())
+    ClipRectsContext(const RenderLayer* inRootLayer, ClipRectsType inClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip inRespectOverflowClip = RespectOverflowClip, const LayoutSize& inSubPixelAccumulation = LayoutSize())
         : rootLayer(inRootLayer)
-        , region(inRegion)
         , clipRectsType(inClipRectsType)
         , overlayScrollbarSizeRelevancy(inOverlayScrollbarSizeRelevancy)
         , respectOverflowClip(inRespectOverflowClip)
         , subPixelAccumulation(inSubPixelAccumulation)
     { }
     const RenderLayer* rootLayer;
-    RenderRegion* region;
     ClipRectsType clipRectsType;
     OverlayScrollbarSizeRelevancy overlayScrollbarSizeRelevancy;
     ShouldRespectOverflowClip respectOverflowClip;