Apply FINAL to the RenderObject hierarchy.

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 8d2bedd0c0c452bed5193c53e4cecd2f1fa2096b..f4a9974657da49d00c4e7b31f74c5f5d5f39b253 100644
--- a/Source/core/rendering/RenderFlowThread.h
+++ b/Source/core/rendering/RenderFlowThread.h
@@ -58,13 +58,13 @@ public:
     RenderFlowThread();
     virtual ~RenderFlowThread() { };
     
-    virtual bool isRenderFlowThread() const { return true; }
+    virtual bool isRenderFlowThread() const FINAL { return true; }
 
-    virtual void layout();
+    virtual void layout() FINAL;
 
     // Always create a RenderLayer for the RenderFlowThread so that we 
     // can easily avoid drawing the children directly.
-    virtual bool requiresLayer() const { return true; }
+    virtual bool requiresLayer() const FINAL { return true; }
     
     void removeFlowChildInfo(RenderObject*);
 #ifndef NDEBUG
@@ -75,7 +75,7 @@ public:
     virtual void removeRegionFromThread(RenderRegion*);
     const RenderRegionList& renderRegionList() const { return m_regionList; }
 
-    virtual void updateLogicalWidth() OVERRIDE;
+    virtual void updateLogicalWidth() OVERRIDE FINAL;
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
 
     void paintFlowThreadPortionInRegion(PaintInfo&, RenderRegion*, LayoutRect flowThreadPortionRect, LayoutRect flowThreadPortionOverflowRect, const LayoutPoint&) const;