Remove column set range map from RenderFlowThread.

Source/core/rendering/RenderFlowThread.h

Index: Source/core/rendering/RenderFlowThread.h
diff --git a/Source/core/rendering/RenderFlowThread.h b/Source/core/rendering/RenderFlowThread.h
index 127edc4e01a4d82fe6b4b20f182eedb382fa6ba8..effccc8e42f27e7346aa86085043af8868bad57f 100644
--- a/Source/core/rendering/RenderFlowThread.h
+++ b/Source/core/rendering/RenderFlowThread.h
@@ -94,8 +94,6 @@ public:
     RenderRegion* firstRegion() const;
     RenderRegion* lastRegion() const;
 
-    void setRegionRangeForBox(const RenderBox*, LayoutUnit offsetFromLogicalTopOfFirstPage);
-
     virtual bool addForcedRegionBreak(LayoutUnit, RenderObject* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment = 0) { return false; }
 
     virtual bool isPageLogicalHeightKnown() const { return true; }
@@ -117,8 +115,6 @@ protected:
     void updateRegionsFlowThreadPortionRect();
     bool shouldIssuePaintInvalidations(const LayoutRect&) const;
 
-    void getRegionRangeForBox(const RenderBox*, RenderMultiColumnSet*& startColumnSet, RenderMultiColumnSet*& endColumnSet) const;
-
     virtual RenderMultiColumnSet* columnSetAtBlockOffset(LayoutUnit) const = 0;
 
     bool cachedOffsetFromLogicalTopOfFirstRegion(const RenderBox*, LayoutUnit&) const;
@@ -177,10 +173,6 @@ protected:
         RenderRegion* m_result;
     };
 
-    // A maps from RenderBox
-    typedef HashMap<const RenderBox*, RenderMultiColumnSetRange> RenderMultiColumnSetRangeMap;
-    RenderMultiColumnSetRangeMap m_multiColumnSetRangeMap;
-
     // 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.