Devirtualize several mediastream class destructors

Source/modules/mediastream/RTCIceCandidate.cpp

 /*
  * Copyright (C) 2012 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
@@ skipping 50 matching lines @@
 {
     return adoptRef(new RTCIceCandidate(webCandidate));
 }
 
 RTCIceCandidate::RTCIceCandidate(WebKit::WebRTCICECandidate webCandidate)
     : m_webCandidate(webCandidate)
 {
     ScriptWrappable::init(this);
 }
 
-RTCIceCandidate::~RTCIceCandidate()
-{
-}
-
 String RTCIceCandidate::candidate() const
 {
     return m_webCandidate.candidate();
 }
 
 String RTCIceCandidate::sdpMid() const
 {
     return m_webCandidate.sdpMid();
 }
 
 unsigned short RTCIceCandidate::sdpMLineIndex() const
 {
     return m_webCandidate.sdpMLineIndex();
 }
 
 WebKit::WebRTCICECandidate RTCIceCandidate::webCandidate()
 {
     return m_webCandidate;
 }
 
 } // namespace WebCore