[New Multicolumn] Cleanup: Remove redundant members.

Source/core/rendering/RenderMultiColumnFlowThread.h

Index: Source/core/rendering/RenderMultiColumnFlowThread.h
diff --git a/Source/core/rendering/RenderMultiColumnFlowThread.h b/Source/core/rendering/RenderMultiColumnFlowThread.h
index 989fe3fec2a895d331bb9981bcf506f7b10c468e..ff5784835b121b9b127f4074265b78e8c6edceb1 100644
--- a/Source/core/rendering/RenderMultiColumnFlowThread.h
+++ b/Source/core/rendering/RenderMultiColumnFlowThread.h
@@ -109,20 +109,24 @@ public:
     void evacuateAndDestroy();
 
     unsigned columnCount() const { return m_columnCount; }
-    LayoutUnit columnWidth() const { return m_columnWidth; }
     LayoutUnit columnHeightAvailable() const { return m_columnHeightAvailable; }
     void setColumnHeightAvailable(LayoutUnit available) { m_columnHeightAvailable = available; }
     bool requiresBalancing() const { return !columnHeightAvailable() || multiColumnBlockFlow()->style()->columnFill() == ColumnFillBalance; }
 
     virtual LayoutSize columnOffset(const LayoutPoint&) const OVERRIDE FINAL;
 
+    // Do we need to set a new width and lay out?
+    bool needsNewWidth() const;
+
     void layoutColumns(bool relayoutChildren, SubtreeLayoutScope&);
-    bool computeColumnCountAndWidth();
+
     bool recalculateColumnHeights();
 
 private:
     RenderMultiColumnFlowThread();
 
+    void calculateColumnCountAndWidth(LayoutUnit& width, unsigned& count) const;
+
     virtual const char* renderName() const OVERRIDE;
     virtual void addRegionToThread(RenderRegion*) OVERRIDE;
     virtual void willBeRemovedFromTree() OVERRIDE;
@@ -136,7 +140,6 @@ private:
     virtual bool isPageLogicalHeightKnown() const OVERRIDE;
 
     unsigned m_columnCount; // The used value of column-count
-    LayoutUnit m_columnWidth; // The used value of column-width
     LayoutUnit m_columnHeightAvailable; // Total height available to columns, or 0 if auto.
     bool m_inBalancingPass; // Set when relayouting for column balancing.
     bool m_needsColumnHeightsRecalculation; // Set when we need to recalculate the column set heights after layout.