Fix virtual/override/final usage in the rest of Source/core/.

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 ba5a065c3eae4198263ecc272e249e37116e21e2..5b28c95ea93c4105e6e2d042c109d4d3787ec479 100644
--- a/Source/core/events/SecurityPolicyViolationEvent.h
+++ b/Source/core/events/SecurityPolicyViolationEvent.h
@@ -54,7 +54,7 @@ public:
     int columnNumber() const { return m_columnNumber; }
     int statusCode() const { return m_statusCode; }
 
-    virtual const AtomicString& interfaceName() const override { return EventNames::SecurityPolicyViolationEvent; }
+    const AtomicString& interfaceName() const override { return EventNames::SecurityPolicyViolationEvent; }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { Event::trace(visitor); }