Update Event classes to use OVERRIDE / FINAL when needed

Source/core/events/SecurityPolicyViolationEvent.h

Index: Source/core/events/SecurityPolicyViolationEvent.h
diff --git a/Source/core/events/SecurityPolicyViolationEvent.h b/Source/core/events/SecurityPolicyViolationEvent.h
index cc88d03875e5ffc318d788596719754f0dab94bc..5c52cab687bba13c1eb51a242985b5f2e4a81e63 100644
--- a/Source/core/events/SecurityPolicyViolationEvent.h
+++ b/Source/core/events/SecurityPolicyViolationEvent.h
@@ -47,7 +47,7 @@ struct SecurityPolicyViolationEventInit : public EventInit {
     int statusCode;
 };
 
-class SecurityPolicyViolationEvent : public Event {
+class SecurityPolicyViolationEvent FINAL : public Event {
 public:
     static PassRefPtr<SecurityPolicyViolationEvent> create()
     {
@@ -70,7 +70,7 @@ public:
     int columnNumber() const { return m_columnNumber; }
     int statusCode() const { return m_statusCode; }
 
-    virtual const AtomicString& interfaceName() const { return EventNames::SecurityPolicyViolationEvent; }
+    virtual const AtomicString& interfaceName() const OVERRIDE { return EventNames::SecurityPolicyViolationEvent; }
 
 private:
     SecurityPolicyViolationEvent()