Replace NULL with nullptr in all C++ files.

webrtc/pc/sctputils.cc

 /*
  *  Copyright 2013 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 146 matching lines @@
       channel_type = DCOMCT_UNORDERED_PARTIAL_RTXS;
       reliability_param = config.maxRetransmits;
     } else if (config.maxRetransmitTime > -1) {
       channel_type = DCOMCT_UNORDERED_PARTIAL_TIME;
       reliability_param = config.maxRetransmitTime;
     } else {
       channel_type = DCOMCT_UNORDERED_RELIABLE;
     }
   }
 
-  rtc::ByteBufferWriter buffer(
-      NULL, 20 + label.length() + config.protocol.length(),
-      rtc::ByteBuffer::ORDER_NETWORK);
+  rtc::ByteBufferWriter buffer(nullptr,
+                               20 + label.length() + config.protocol.length(),
+                               rtc::ByteBuffer::ORDER_NETWORK);
   // TODO(tommi): Add error handling and check resulting length.
   buffer.WriteUInt8(DATA_CHANNEL_OPEN_MESSAGE_TYPE);
   buffer.WriteUInt8(channel_type);
   buffer.WriteUInt16(priority);
   buffer.WriteUInt32(reliability_param);
   buffer.WriteUInt16(static_cast<uint16_t>(label.length()));
   buffer.WriteUInt16(static_cast<uint16_t>(config.protocol.length()));
   buffer.WriteString(label);
   buffer.WriteString(config.protocol);
   payload->SetData(buffer.Data(), buffer.Length());
   return true;
 }
 
 void WriteDataChannelOpenAckMessage(rtc::CopyOnWriteBuffer* payload) {
   uint8_t data = DATA_CHANNEL_OPEN_ACK_MESSAGE_TYPE;
   payload->SetData(&data, sizeof(data));
 }
 
 }  // namespace webrtc