Fix virtual/override/final usage in Source/core/dom/.

Source/core/dom/DOMURL.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2012 Motorola Mobility Inc.
  *
  * 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.
@@ skipping 46 matching lines @@
         ASSERT(base);
         return new DOMURL(url, base->m_url, exceptionState);
     }
 
     static String createObjectURL(ExecutionContext*, Blob*, ExceptionState&);
     static void revokeObjectURL(ExecutionContext*, const String&);
 
     CORE_EXPORT static String createPublicURL(ExecutionContext*, URLRegistrable*, const String& uuid = String());
     static void revokeObjectUUID(ExecutionContext*, const String&);
 
-    virtual KURL url() const override { return m_url; }
-    virtual void setURL(const KURL& url) override { m_url = url; }
+    KURL url() const override { return m_url; }
+    void setURL(const KURL& url) override { m_url = url; }
 
-    virtual String input() const override { return m_input; }
-    virtual void setInput(const String&) override;
+    String input() const override { return m_input; }
+    void setInput(const String&) override;
 
     DEFINE_INLINE_TRACE() { }
 
 private:
     DOMURL(const String& url, const KURL& base, ExceptionState&);
 
     KURL m_url;
     String m_input;
 };
 
 } // namespace blink
 
 #endif // DOMURL_h