Remove some unused paint invalidation members from RenderObject.

sky/engine/core/rendering/RenderBlockFlow.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003-2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ skipping 97 matching lines @@
 
     void setStaticInlinePositionForChild(RenderBox*, LayoutUnit inlinePosition);
     void updateStaticInlinePositionForChild(RenderBox*);
 
     static bool shouldSkipCreatingRunsForObject(RenderObject* obj)
     {
         return obj->isOutOfFlowPositioned() && !obj->style()->isOriginalDisplayInlineType() && !obj->container()->isRenderInline();
     }
 
 protected:
-    virtual void layoutChildren(bool relayoutChildren, SubtreeLayoutScope&, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutUnit beforeEdge, LayoutUnit afterEdge);
+    virtual void layoutChildren(bool relayoutChildren, SubtreeLayoutScope&, LayoutUnit beforeEdge, LayoutUnit afterEdge);
 
     virtual bool updateLogicalWidthAndColumnWidth() override;
 
     void determineLogicalLeftPositionForChild(RenderBox* child);
 
 private:
     void layoutBlockFlow(bool relayoutChildren, SubtreeLayoutScope&);
 
     void layoutBlockChild(RenderBox* child);
     void adjustPositionedBlock(RenderBox* child);
 
     RootInlineBox* createRootInlineBox();
 
 public:
     struct FloatWithRect {
         FloatWithRect(RenderBox* f)
             : object(f)
             , rect(LayoutRect(f->x() - f->marginLeft(), f->y() - f->marginTop(), f->width() + f->marginWidth(), f->height() + f->marginHeight()))
             , everHadLayout(f->everHadLayout())
         {
         }
 
         RenderBox* object;
         LayoutRect rect;
         bool everHadLayout;
     };
 
-private:
-    LayoutUnit m_paintInvalidationLogicalTop;
-    LayoutUnit m_paintInvalidationLogicalBottom;
-
 protected:
     friend class BreakingContext; // FIXME: It uses insertFloatingObject and positionNewFloatOnLine, if we move those out from the private scope/add a helper to LineBreaker, we can remove this friend
     friend class LineBreaker;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlockFlow, isRenderBlockFlow());
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERBLOCKFLOW_H_