Fix no_size_t_to_int_warning in rtp_rtcp:rtp_rtcp_format target

webrtc/modules/rtp_rtcp/source/rtp_packet_received.cc

 /*
  *  Copyright (c) 2017 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/modules/rtp_rtcp/source/rtp_packet_received.h"
 
 #include <vector>
 
 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h"
+#include "webrtc/rtc_base/safe_conversions.h"
 
 namespace webrtc {
 
 void RtpPacketReceived::GetHeader(RTPHeader* header) const {
   header->markerBit = Marker();
   header->payloadType = PayloadType();
   header->sequenceNumber = SequenceNumber();
   header->timestamp = Timestamp();
   header->ssrc = Ssrc();
   std::vector<uint32_t> csrcs = Csrcs();
-  header->numCSRCs = csrcs.size();
+  header->numCSRCs = rtc::dchecked_cast<uint8_t>(csrcs.size());
   for (size_t i = 0; i < csrcs.size(); ++i) {
     header->arrOfCSRCs[i] = csrcs[i];
   }
   header->paddingLength = padding_size();
   header->headerLength = headers_size();
   header->payload_type_frequency = payload_type_frequency();
   header->extension.hasTransmissionTimeOffset =
       GetExtension<TransmissionOffset>(
           &header->extension.transmissionTimeOffset);
   header->extension.hasAbsoluteSendTime =
@@ skipping 10 matching lines @@
           &header->extension.videoContentType);
   header->extension.has_video_timing =
       GetExtension<VideoTimingExtension>(&header->extension.video_timing);
   GetExtension<RtpStreamId>(&header->extension.stream_id);
   GetExtension<RepairedRtpStreamId>(&header->extension.repaired_stream_id);
   GetExtension<RtpMid>(&header->extension.mid);
   GetExtension<PlayoutDelayLimits>(&header->extension.playout_delay);
 }
 
 }  // namespace webrtc