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

Source/core/events/AutocompleteErrorEvent.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 32 matching lines @@
         return adoptRefWillBeNoop(new AutocompleteErrorEvent(reason));
     }
 
     static PassRefPtrWillBeRawPtr<AutocompleteErrorEvent> create(const AtomicString& eventType, const AutocompleteErrorEventInit& initializer)
     {
         return adoptRefWillBeNoop(new AutocompleteErrorEvent(eventType, initializer));
     }
 
     const String& reason() const { return m_reason; }
 
-    virtual const AtomicString& interfaceName() const override { return EventNames::AutocompleteErrorEvent; }
+    const AtomicString& interfaceName() const override { return EventNames::AutocompleteErrorEvent; }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { Event::trace(visitor); }
 
 private:
     AutocompleteErrorEvent() { }
 
     AutocompleteErrorEvent(const String& reason)
         : Event(EventTypeNames::autocompleteerror, true, false)
         , m_reason(reason) { }
 
     AutocompleteErrorEvent(const AtomicString& eventType, const AutocompleteErrorEventInit& initializer)
         : Event(eventType, initializer)
     {
         if (initializer.hasReason())
             m_reason = initializer.reason();
     }
 
     String m_reason;
 };
 
 } // namespace blink
 
 #endif // AutocompleteErrorEvent_h