Replace NULL with nullptr in all C++ files.

webrtc/media/base/rtpdataengine.cc

 /*
  *  Copyright (c) 2012 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 69 matching lines @@
 }
 
 const DataCodec* FindUnknownCodec(const std::vector<DataCodec>& codecs) {
   DataCodec data_codec(kGoogleRtpDataCodecPlType, kGoogleRtpDataCodecName);
   std::vector<DataCodec>::const_iterator iter;
   for (iter = codecs.begin(); iter != codecs.end(); ++iter) {
     if (!iter->Matches(data_codec)) {
       return &(*iter);
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 const DataCodec* FindKnownCodec(const std::vector<DataCodec>& codecs) {
   DataCodec data_codec(kGoogleRtpDataCodecPlType, kGoogleRtpDataCodecName);
   std::vector<DataCodec>::const_iterator iter;
   for (iter = codecs.begin(); iter != codecs.end(); ++iter) {
     if (iter->Matches(data_codec)) {
       return &(*iter);
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 bool RtpDataMediaChannel::SetRecvCodecs(const std::vector<DataCodec>& codecs) {
   const DataCodec* unknown_codec = FindUnknownCodec(codecs);
   if (unknown_codec) {
     LOG(LS_WARNING) << "Failed to SetRecvCodecs because of unknown codec: "
                     << unknown_codec->ToString();
     return false;
   }
 
@@ skipping 225 matching lines @@
     *result = SDR_SUCCESS;
   }
   return true;
 }
 
 rtc::DiffServCodePoint RtpDataMediaChannel::PreferredDscp() const {
   return rtc::DSCP_AF41;
 }
 
 }  // namespace cricket