Implement navigator.languages.

Source/core/frame/Navigator.h

 /*
     Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 47 matching lines @@
 
     String productSub() const;
     String vendor() const;
     String vendorSub() const;
 
     virtual String userAgent() const OVERRIDE;
 
     // Relinquishes the storage lock, if one exists.
     void getStorageUpdates();
 
+    // NavigatorLanguage
+    virtual Vector<String> languages() OVERRIDE;
+
     virtual void trace(Visitor*);
 
 private:
     explicit Navigator(LocalFrame*);
 
     mutable RefPtrWillBeMember<DOMPluginArray> m_plugins;
     mutable RefPtrWillBeMember<DOMMimeTypeArray> m_mimeTypes;
 };
 
 }
 
 #endif