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

webrtc/base/asyncudpsocket.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.
  */
 
 #include "webrtc/base/asyncudpsocket.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 
 namespace rtc {
 
 static const int BUF_SIZE = 64 * 1024;
 
 AsyncUDPSocket* AsyncUDPSocket::Create(
     AsyncSocket* socket,
     const SocketAddress& bind_address) {
   std::unique_ptr<AsyncSocket> owned_socket(socket);
   if (socket->Bind(bind_address) < 0) {
     LOG(LS_ERROR) << "Bind() failed with error " << socket->GetError();
-    return NULL;
+    return nullptr;
   }
   return new AsyncUDPSocket(owned_socket.release());
 }
 
 AsyncUDPSocket* AsyncUDPSocket::Create(SocketFactory* factory,
                                        const SocketAddress& bind_address) {
   AsyncSocket* socket =
       factory->CreateAsyncSocket(bind_address.family(), SOCK_DGRAM);
   if (!socket)
-    return NULL;
+    return nullptr;
   return Create(socket, bind_address);
 }
 
 AsyncUDPSocket::AsyncUDPSocket(AsyncSocket* socket)
     : socket_(socket) {
   size_ = BUF_SIZE;
   buf_ = new char[size_];
 
   // The socket should start out readable but not writable.
   socket_->SignalReadEvent.connect(this, &AsyncUDPSocket::OnReadEvent);
@@ skipping 75 matching lines @@
   SignalReadPacket(
       this, buf_, static_cast<size_t>(len), remote_addr,
       (timestamp > -1 ? PacketTime(timestamp, 0) : CreatePacketTime(0)));
 }
 
 void AsyncUDPSocket::OnWriteEvent(AsyncSocket* socket) {
   SignalReadyToSend(this);
 }
 
 }  // namespace rtc