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

webrtc/base/socketaddress.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 166 matching lines @@
   ost << HostAsSensitiveURIString() << ":" << port();
   return ost.str();
 }
 
 bool SocketAddress::FromString(const std::string& str) {
   if (str.at(0) == '[') {
     std::string::size_type closebracket = str.rfind(']');
     if (closebracket != std::string::npos) {
       std::string::size_type colon = str.find(':', closebracket);
       if (colon != std::string::npos && colon > closebracket) {
-        SetPort(strtoul(str.substr(colon + 1).c_str(), NULL, 10));
+        SetPort(strtoul(str.substr(colon + 1).c_str(), nullptr, 10));
         SetIP(str.substr(1, closebracket - 1));
       } else {
         return false;
       }
     }
   } else {
     std::string::size_type pos = str.find(':');
     if (std::string::npos == pos)
       return false;
-    SetPort(strtoul(str.substr(pos + 1).c_str(), NULL, 10));
+    SetPort(strtoul(str.substr(pos + 1).c_str(), nullptr, 10));
     SetIP(str.substr(0, pos));
   }
   return true;
 }
 
 std::ostream& operator<<(std::ostream& os, const SocketAddress& addr) {
   os << addr.HostAsURIString() << ":" << addr.port();
   return os;
 }
 
@@ skipping 122 matching lines @@
 SocketAddress EmptySocketAddressWithFamily(int family) {
   if (family == AF_INET) {
     return SocketAddress(IPAddress(INADDR_ANY), 0);
   } else if (family == AF_INET6) {
     return SocketAddress(IPAddress(in6addr_any), 0);
   }
   return SocketAddress();
 }
 
 }  // namespace rtc