Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/neteq/tools/rtp_file_source.cc

 /*
  *  Copyright (c) 2014 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 41 matching lines @@
 bool RtpFileSource::RegisterRtpHeaderExtension(RTPExtensionType type,
                                                uint8_t id) {
   assert(parser_.get());
   return parser_->RegisterRtpHeaderExtension(type, id);
 }
 
 std::unique_ptr<Packet> RtpFileSource::NextPacket() {
   while (true) {
     RtpPacket temp_packet;
     if (!rtp_reader_->NextPacket(&temp_packet)) {
-      return NULL;
+      return nullptr;
     }
     if (temp_packet.original_length == 0) {
       // May be an RTCP packet.
       // Read the next one.
       continue;
     }
     std::unique_ptr<uint8_t[]> packet_memory(new uint8_t[temp_packet.length]);
     memcpy(packet_memory.get(), temp_packet.data, temp_packet.length);
     std::unique_ptr<Packet> packet(new Packet(
         packet_memory.release(), temp_packet.length,
         temp_packet.original_length, temp_packet.time_ms, *parser_.get()));
     if (!packet->valid_header()) {
       assert(false);
-      return NULL;
+      return nullptr;
     }
     if (filter_.test(packet->header().payloadType) ||
         (use_ssrc_filter_ && packet->header().ssrc != ssrc_)) {
       // This payload type should be filtered out. Continue to the next packet.
       continue;
     }
     return packet;
   }
 }
 
 RtpFileSource::RtpFileSource()
     : PacketSource(),
       parser_(RtpHeaderParser::Create()) {}
 
 bool RtpFileSource::OpenFile(const std::string& file_name) {
   rtp_reader_.reset(RtpFileReader::Create(RtpFileReader::kRtpDump, file_name));
   if (rtp_reader_)
     return true;
   rtp_reader_.reset(RtpFileReader::Create(RtpFileReader::kPcap, file_name));
   if (!rtp_reader_) {
     FATAL() << "Couldn't open input file as either a rtpdump or .pcap. Note "
                "that .pcapng is not supported.";
   }
   return true;
 }
 
 }  // namespace test
 }  // namespace webrtc