Delete PaintInvalidationState. It's unused.

sky/engine/core/rendering/LayoutState.h

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef SKY_ENGINE_CORE_RENDERING_LAYOUTSTATE_H_
 #define SKY_ENGINE_CORE_RENDERING_LAYOUTSTATE_H_
 
 #include "sky/engine/platform/geometry/LayoutRect.h"
 #include "sky/engine/wtf/HashMap.h"
 #include "sky/engine/wtf/Noncopyable.h"
 
 namespace blink {
 
-class ForceHorriblySlowRectMapping;
 class RenderBox;
 class RenderObject;
 class RenderInline;
 class RenderView;
 
 class LayoutState {
     WTF_MAKE_NONCOPYABLE(LayoutState);
 public:
     // Constructor for root LayoutState created by RenderView
     explicit LayoutState(RenderView&);
     // Constructor for sub-tree Layout and RenderTableSections
     explicit LayoutState(RenderObject& root);
 
     LayoutState(RenderBox&, const LayoutSize& offset, bool containingBlockLogicalWidthChanged = false);
     LayoutState(RenderInline&);
 
     ~LayoutState();
 
     const LayoutSize& layoutOffset() const { return m_layoutOffset; }
     bool containingBlockLogicalWidthChanged() const { return m_containingBlockLogicalWidthChanged; }
 
     LayoutState* next() const { return m_next; }
 
     RenderObject& renderer() const { return m_renderer; }
 
 private:
-    friend class ForceHorriblySlowRectMapping;
-
     bool m_containingBlockLogicalWidthChanged : 1;
 
     LayoutState* m_next;
 
     // x/y offset from container. Does not include relative positioning or scroll offsets.
     LayoutSize m_layoutOffset;
 
     RenderObject& m_renderer;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_LAYOUTSTATE_H_