Update rendering classes to use OVERRIDE / FINAL when needed

Source/core/rendering/ClipPathOperation.h

Index: Source/core/rendering/ClipPathOperation.h
diff --git a/Source/core/rendering/ClipPathOperation.h b/Source/core/rendering/ClipPathOperation.h
index 171634dd23dc037bf4bff2047f9a5dd64792a94b..bf64113d84890a7cb68aa879c0dc5689e7bb5086 100644
--- a/Source/core/rendering/ClipPathOperation.h
+++ b/Source/core/rendering/ClipPathOperation.h
@@ -63,7 +63,7 @@ protected:
     OperationType m_type;
 };
 
-class ReferenceClipPathOperation : public ClipPathOperation {
+class ReferenceClipPathOperation FINAL : public ClipPathOperation {
 public:
     static PassRefPtr<ReferenceClipPathOperation> create(const String& url, const AtomicString& fragment)
     {
@@ -92,7 +92,7 @@ private:
 
 DEFINE_TYPE_CASTS(ReferenceClipPathOperation, ClipPathOperation, op, op->type() == ClipPathOperation::REFERENCE, op.type() == ClipPathOperation::REFERENCE);
 
-class ShapeClipPathOperation : public ClipPathOperation {
+class ShapeClipPathOperation FINAL : public ClipPathOperation {
 public:
     static PassRefPtr<ShapeClipPathOperation> create(PassRefPtr<BasicShape> shape)
     {