namespace blink {
-class NodeMutationObserverData FINAL : public NoBaseWillBeGarbageCollected<NodeMutationObserverData> {
+class NodeMutationObserverData final : public NoBaseWillBeGarbageCollected<NodeMutationObserverData> {
WTF_MAKE_NONCOPYABLE(NodeMutationObserverData);
WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
public: