Fix more warnings on linux

Source/core/dom/DOMURLUtilsReadOnly.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 19 matching lines @@
 #include "weborigin/KURL.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class DOMURLUtilsReadOnly {
 public:
     virtual KURL url() const = 0;
     virtual String input() const = 0;
+    virtual ~DOMURLUtilsReadOnly() { };
 
     static String href(DOMURLUtilsReadOnly*);
 
     static String origin(const KURL&);
     static String origin(DOMURLUtilsReadOnly* impl) { return origin(impl->url()); }
 
     static String protocol(const KURL& url) { return url.protocol() + ":"; }
     static String protocol(DOMURLUtilsReadOnly* impl) { return protocol(impl->url()); }
 
     static String username(const KURL& url) { return url.user(); }
@@ skipping 17 matching lines @@
     static String search(const KURL&);
     static String search(DOMURLUtilsReadOnly* impl) { return search(impl->url()); }
 
     static String hash(const KURL&);
     static String hash(DOMURLUtilsReadOnly* impl) { return hash(impl->url()); }
 };
 
 } // namespace WebCore
 
 #endif // DOMURLUtilsReadOnly_h