Remove RenderFlowThread::initialLogicalWidth().

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 088d523a4a57ba3c0793a83d35bf68fc114972f2..bb97025faa64173c5a74a637f20c84f220aed6fa 100644
--- a/Source/core/rendering/RenderFlowThread.h
+++ b/Source/core/rendering/RenderFlowThread.h
@@ -72,7 +72,6 @@ public:
     virtual void removeRegionFromThread(RenderRegion*);
     const RenderRegionList& renderRegionList() const { return m_regionList; }
 
-    virtual void updateLogicalWidth() OVERRIDE FINAL;
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
 
     bool hasRegions() const { return m_regionList.size(); }
@@ -121,10 +120,6 @@ public:
 protected:
     virtual const char* renderName() const = 0;
 
-    // Overridden by columns/pages to set up an initial logical width of the page width even when
-    // no regions have been generated yet.
-    virtual LayoutUnit initialLogicalWidth() const { return 0; };
-
     void updateRegionsFlowThreadPortionRect();
     bool shouldRepaint(const LayoutRect&) const;