Remove RenderFlowThread::offsetFromLogicalTopOfFirstRegion().

Source/core/rendering/RenderFlowThread.h

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
@@ skipping 88 matching lines @@
     bool pageLogicalSizeChanged() const { return m_pageLogicalSizeChanged; }
 
     void collectLayerFragments(LayerFragments&, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect);
     LayoutRect fragmentsBoundingBox(const LayoutRect& layerBoundingBox) const;
 
     LayoutPoint flowThreadPointToVisualPoint(const LayoutPoint& flowThreadPoint) const
     {
         return flowThreadPoint + columnOffset(flowThreadPoint);
     }
 
-    void pushFlowThreadLayoutState(const RenderObject&);
-    void popFlowThreadLayoutState();
-    LayoutUnit offsetFromLogicalTopOfFirstRegion(const RenderBlock*) const;
-
     // Used to estimate the maximum height of the flow thread.
     static LayoutUnit maxLogicalHeight() { return LayoutUnit::max() / 2; }
 
 protected:
     virtual const char* renderName() const = 0;
 
     void updateRegionsFlowThreadPortionRect();
 
     virtual RenderMultiColumnSet* columnSetAtBlockOffset(LayoutUnit) const = 0;
 
-    bool cachedOffsetFromLogicalTopOfFirstRegion(const RenderBox*, LayoutUnit&) const;
-    void setOffsetFromLogicalTopOfFirstRegion(const RenderBox*, LayoutUnit);
-    void clearOffsetFromLogicalTopOfFirstRegion(const RenderBox*);
-
-    const RenderBox* currentStatePusherRenderBox() const;
-
     RenderMultiColumnSetList m_multiColumnSetList;
 
     typedef PODInterval<LayoutUnit, RenderMultiColumnSet*> MultiColumnSetInterval;
     typedef PODIntervalTree<LayoutUnit, RenderMultiColumnSet*> MultiColumnSetIntervalTree;
 
     class RegionSearchAdapter {
     public:
         RegionSearchAdapter(LayoutUnit offset)
             : m_offset(offset)
             , m_result(0)
         {
         }
 
         const LayoutUnit& lowValue() const { return m_offset; }
         const LayoutUnit& highValue() const { return m_offset; }
         void collectIfNeeded(const MultiColumnSetInterval&);
 
         RenderRegion* result() const { return m_result; }
 
     private:
         LayoutUnit m_offset;
         RenderRegion* m_result;
     };
 
-    // Stack of objects that pushed a LayoutState object on the RenderView. The
-    // objects on the stack are the ones that are curently in the process of being
-    // laid out.
-    ListHashSet<const RenderObject*> m_statePusherObjectsStack;
-    typedef HashMap<const RenderBox*, LayoutUnit> RenderBoxToOffsetMap;
-    RenderBoxToOffsetMap m_boxesToOffsetMap;
-
     MultiColumnSetIntervalTree m_multiColumnSetIntervalTree;
 
     bool m_regionsInvalidated : 1;
     bool m_regionsHaveUniformLogicalHeight : 1;
     bool m_pageLogicalSizeChanged : 1;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFlowThread, isRenderFlowThread());
 
 // These structures are used by PODIntervalTree for debugging.
 #ifndef NDEBUG
 template <> struct ValueToString<LayoutUnit> {
     static String string(const LayoutUnit value) { return String::number(value.toFloat()); }
 };
 
 template <> struct ValueToString<RenderMultiColumnSet*> {
     static String string(const RenderMultiColumnSet* value) { return String::format("%p", value); }
 };
 #endif
 
 } // namespace blink
 
 #endif // RenderFlowThread_h