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

Source/core/events/BeforeUnloadEvent.h

Index: Source/core/events/BeforeUnloadEvent.h
diff --git a/Source/core/events/BeforeUnloadEvent.h b/Source/core/events/BeforeUnloadEvent.h
index ef7dedd5a6d984cbd48b5ebb7713a4e5aa9c62b9..9898dedc05dfd23a755bee767f5d7176ede53f2c 100644
--- a/Source/core/events/BeforeUnloadEvent.h
+++ b/Source/core/events/BeforeUnloadEvent.h
@@ -29,7 +29,7 @@
 
 namespace blink {
 
-class BeforeUnloadEvent FINAL : public Event {
+class BeforeUnloadEvent final : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     virtual ~BeforeUnloadEvent();
@@ -39,14 +39,14 @@ public:
         return adoptRefWillBeNoop(new BeforeUnloadEvent);
     }
 
-    virtual bool isBeforeUnloadEvent() const OVERRIDE;
+    virtual bool isBeforeUnloadEvent() const override;
 
     void setReturnValue(const String& returnValue) { m_returnValue = returnValue; }
     String returnValue() const { return m_returnValue; }
 
-    virtual const AtomicString& interfaceName() const OVERRIDE { return EventNames::BeforeUnloadEvent; }
+    virtual const AtomicString& interfaceName() const override { return EventNames::BeforeUnloadEvent; }
 
-    virtual void trace(Visitor*) OVERRIDE;
+    virtual void trace(Visitor*) override;
 
 private:
     BeforeUnloadEvent();