Replace FINAL and OVERRIDE with their C++11 counterparts in Source/core/events

Source/core/events/MutationEvent.h

Index: Source/core/events/MutationEvent.h
diff --git a/Source/core/events/MutationEvent.h b/Source/core/events/MutationEvent.h
index 4a17aeb1841b6c6e03a622c0d29c16a2914ca0ff..e7e923804f9ae14bae9d90f57796d16c70826149 100644
--- a/Source/core/events/MutationEvent.h
+++ b/Source/core/events/MutationEvent.h
@@ -29,7 +29,7 @@
 
 namespace blink {
 
-class MutationEvent FINAL : public Event {
+class MutationEvent final : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     virtual ~MutationEvent();
@@ -60,9 +60,9 @@ public:
     String attrName() const { return m_attrName; }
     unsigned short attrChange() const { return m_attrChange; }
 
-    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual const AtomicString& interfaceName() const override;
 
-    virtual void trace(Visitor*) OVERRIDE;
+    virtual void trace(Visitor*) override;
 
 private:
     MutationEvent();