Rename FecReceiver to UlpfecReceiver.

webrtc/modules/rtp_rtcp/source/flexfec_receiver_impl.cc

 /*
  *  Copyright (c) 2016 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 113 matching lines @@
            parsed_packet.size());
     received_packet->pkt->length = parsed_packet.size();
   }
   received_packets_.push_back(std::move(received_packet));
   ++packet_counter_.num_packets;
 
   return true;
 }
 
 // Note that the implementation of this member function and the implementation
-// in FecReceiver::ProcessReceivedFec() are slightly different.
+// in UlpfecReceiver::ProcessReceivedFec() are slightly different.
 // This implementation only returns _recovered_ media packets through the
-// callback, whereas the implementation in FecReceiver returns _all inserted_
+// callback, whereas the implementation in UlpfecReceiver returns _all inserted_
 // media packets through the callback. The latter behaviour makes sense
 // for ULPFEC, since the ULPFEC receiver is owned by the RtpStreamReceiver.
 // Here, however, the received media pipeline is more decoupled from the
 // FlexFEC decoder, and we therefore do not interfere with the reception
 // of non-recovered media packets.
 bool FlexfecReceiverImpl::ProcessReceivedPackets() {
   RTC_DCHECK(sequence_checker_.CalledSequentially());
 
   // Decode.
   if (!received_packets_.empty()) {
@@ skipping 22 matching lines @@
       ss << "Recovered media packet with SSRC: " << media_ssrc
          << " from FlexFEC stream with SSRC: " << flexfec_ssrc_ << ".";
       LOG(LS_INFO) << ss.str();
       last_recovered_packet_ms_ = now_ms;
     }
   }
   return true;
 }
 
 }  // namespace webrtc