Remove iostream which causes a new static initializer

webrtc/p2p/stunprober/stunprober.cc

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include <iostream>
 #include <map>
 #include <set>
 #include <string>
 
 #include "webrtc/base/asyncpacketsocket.h"
 #include "webrtc/base/asyncresolverinterface.h"
 #include "webrtc/base/bind.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/helpers.h"
 #include "webrtc/base/logging.h"
@@ skipping 504 matching lines @@
   if (!finished_callback_.empty()) {
     AsyncCallback callback = finished_callback_;
     finished_callback_ = AsyncCallback();
 
     // Callback at the last since the prober might be deleted in the callback.
     callback(this, status);
   }
 }
 
 }  // namespace stunprober