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

webrtc/base/socketadapters.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 263 matching lines @@
 
 SocketAddress AsyncHttpsProxySocket::GetRemoteAddress() const {
   return dest_;
 }
 
 int AsyncHttpsProxySocket::Close() {
   headers_.clear();
   state_ = PS_ERROR;
   dest_.Clear();
   delete context_;
-  context_ = NULL;
+  context_ = nullptr;
   return BufferedReadAdapter::Close();
 }
 
 Socket::ConnState AsyncHttpsProxySocket::GetState() const {
   if (state_ < PS_TUNNEL) {
     return CS_CONNECTING;
   } else if (state_ == PS_TUNNEL) {
     return CS_CONNECTED;
   } else {
     return CS_CLOSED;
@@ skipping 544 matching lines @@
 
 void AsyncSocksProxyServerSocket::Error(int error) {
   state_ = SS_ERROR;
   BufferInput(false);
   Close();
   SetError(SOCKET_EACCES);
   SignalCloseEvent(this, error);
 }
 
 }  // namespace rtc