wifi: Prohibit overriding WifiInformationElement::Serialize() and ::GetSerializedSize()

src/wifi/model/wifi-information-element.h

@@ -247,7 +247,7 @@ public:
    *
    * \return an iterator
    */
-  virtual Buffer::Iterator Serialize (Buffer::Iterator i) const;
+  Buffer::Iterator Serialize (Buffer::Iterator i) const;
   /**
    * Deserialize entire IE, which must be present. The iterator
    * passed in must be pointing at the Element ID (i.e., the very
@@ -294,7 +294,7 @@ public:
    *
    * \return the size of the serialized IE in bytes
    */
-  virtual uint16_t GetSerializedSize () const;
+  uint16_t GetSerializedSize () const;
 
   // Each subclass must implement these pure virtual functions:
   /**