Replace NULL with nullptr in all C++ files.

webrtc/p2p/base/asyncstuntcpsocket.cc

 /*
  *  Copyright 2013 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.
  */
 
@@ skipping 15 matching lines @@
 static const size_t kBufSize = kMaxPacketSize + kStunHeaderSize;
 static const size_t kTurnChannelDataHdrSize = 4;
 
 inline bool IsStunMessage(uint16_t msg_type) {
   // The first two bits of a channel data message are 0b01.
   return (msg_type & 0xC000) ? false : true;
 }
 
 // AsyncStunTCPSocket
 // Binds and connects |socket| and creates AsyncTCPSocket for
-// it. Takes ownership of |socket|. Returns NULL if bind() or
+// it. Takes ownership of |socket|. Returns null if bind() or
 // connect() fail (|socket| is destroyed in that case).
 AsyncStunTCPSocket* AsyncStunTCPSocket::Create(
     rtc::AsyncSocket* socket,
     const rtc::SocketAddress& bind_address,
     const rtc::SocketAddress& remote_address) {
   return new AsyncStunTCPSocket(AsyncTCPSocketBase::ConnectSocket(
       socket, bind_address, remote_address), false);
 }
 
 AsyncStunTCPSocket::AsyncStunTCPSocket(
@@ skipping 97 matching lines @@
     // message (including padding) is (4 + Length) rounded up to the nearest
     // multiple of 4.  Over UDP, the padding is not required but MAY be
     // included.
     if (expected_pkt_len % 4)
       *pad_bytes = 4 - (expected_pkt_len % 4);
   }
   return expected_pkt_len;
 }
 
 }  // namespace cricket