*** NOT FOR LANDING *** mapLocalToContainer and offsetFromContainer cleanup.

Source/core/layout/LayoutMultiColumnFlowThread.h

Index: Source/core/layout/LayoutMultiColumnFlowThread.h
diff --git a/Source/core/layout/LayoutMultiColumnFlowThread.h b/Source/core/layout/LayoutMultiColumnFlowThread.h
index 4aa9c5debf4b66928f4b8eef532be3a0f3b121d4..0d28cca8686ff696714049314190958ad76db6b4 100644
--- a/Source/core/layout/LayoutMultiColumnFlowThread.h
+++ b/Source/core/layout/LayoutMultiColumnFlowThread.h
@@ -168,7 +168,7 @@ public:
     // Do we need to set a new width and lay out?
     virtual bool needsNewWidth() const;
 
-    virtual LayoutPoint visualPointToFlowThreadPoint(const LayoutPoint& visualPoint) const override;
+    LayoutPoint visualPointToFlowThreadPoint(const LayoutPoint& visualPoint) const;
 
     virtual LayoutMultiColumnSet* columnSetAtBlockOffset(LayoutUnit) const override final;
 
@@ -206,6 +206,7 @@ private:
     virtual void computePreferredLogicalWidths() override;
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
     virtual void updateLogicalWidth() override;
+    virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override;
     virtual void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage) override;
     virtual void updateMinimumPageHeight(LayoutUnit offset, LayoutUnit minHeight) override;
     virtual bool addForcedColumnBreak(LayoutUnit, LayoutObject* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment = nullptr) override;