Replace NULL with nullptr or null in webrtc/base/.

webrtc/base/winping.cc

 /*
  *  Copyright 2004 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 231 matching lines @@
   DWORD result = 0;
   if (ip.family() == AF_INET) {
     result = send_(hping_, ip.ipv4_address().S_un.S_addr, data_,
                    uint16_t(data_size), &ipopt, reply_, reply_size, timeout);
   } else if (ip.family() == AF_INET6) {
     sockaddr_in6 src = {0};
     sockaddr_in6 dst = {0};
     src.sin6_family = AF_INET6;
     dst.sin6_family = AF_INET6;
     dst.sin6_addr = ip.ipv6_address();
-    result = send6_(hping6_, NULL, NULL, NULL, &src, &dst, data_,
+    result = send6_(hping6_, nullptr, nullptr, nullptr, &src, &dst, data_,
                     int16_t(data_size), &ipopt, reply_, reply_size, timeout);
   }
   if (result == 0) {
     DWORD error = GetLastError();
     if (error == IP_PACKET_TOO_BIG)
       return PING_TOO_LARGE;
     if (error == IP_REQ_TIMED_OUT)
       return PING_TIMEOUT;
     LOG(LERROR) << "IcmpSendEcho(" << ip.ToSensitiveString()
                 << ", " << data_size << "): " << error;
@@ skipping 60 matching lines @@
 //     IcmpHandle           - An open handle returned by ICMPCreateFile.
 //
 //     DestinationAddress   - The destination of the echo request.
 //
 //     RequestData          - A buffer containing the data to send in the
 //                            request.
 //
 //     RequestSize          - The number of bytes in the request data buffer.
 //
 //     RequestOptions       - Pointer to the IP header options for the request.
-//                            May be NULL.
+//                            May be null.
 //
 //     ReplyBuffer          - A buffer to hold any replies to the request.
 //                            On return, the buffer will contain an array of
 //                            ICMP_ECHO_REPLY structures followed by the
 //                            options and data for the replies. The buffer
 //                            should be large enough to hold at least one
 //                            ICMP_ECHO_REPLY structure plus
 //                            MAX(RequestSize, 8) bytes of data since an ICMP
 //                            error message contains 8 bytes of data.
 //
 //     ReplySize            - The size in bytes of the reply buffer.
 //
 //     Timeout              - The time in milliseconds to wait for replies.
 //
 // Return Value:
 //
 //     Returns the number of ICMP_ECHO_REPLY structures stored in ReplyBuffer.
 //     The status of each reply is contained in the structure. If the return
 //     value is zero, extended error information is available via
 //     GetLastError().
 //
 //////////////////////////////////////////////////////////////////////
 
 } // namespace rtc