Update remaining rendering classes to use OVERRIDE / FINAL when needed

Source/core/rendering/shapes/PolygonShape.h

Index: Source/core/rendering/shapes/PolygonShape.h
diff --git a/Source/core/rendering/shapes/PolygonShape.h b/Source/core/rendering/shapes/PolygonShape.h
index b6673883b76993eb0d74f2a771135591f4267973..9f0e93af0e3f83fbbce1903582ed18c4cf9df0b2 100644
--- a/Source/core/rendering/shapes/PolygonShape.h
+++ b/Source/core/rendering/shapes/PolygonShape.h
@@ -35,7 +35,7 @@
 
 namespace WebCore {
 
-class OffsetPolygonEdge : public VertexPair {
+class OffsetPolygonEdge FINAL : public VertexPair {
 public:
     enum Basis {
         Edge,
@@ -79,7 +79,7 @@ private:
     Basis m_basis;
 };
 
-class PolygonShape : public Shape {
+class PolygonShape FINAL : public Shape {
     WTF_MAKE_NONCOPYABLE(PolygonShape);
 public:
     PolygonShape(PassOwnPtr<Vector<FloatPoint> > vertices, WindRule fillRule)