Unwrap picture ids in the RtpFrameReferencerFinder.

webrtc/video/rtp_video_stream_receiver.cc

Index: webrtc/video/rtp_video_stream_receiver.cc
diff --git a/webrtc/video/rtp_video_stream_receiver.cc b/webrtc/video/rtp_video_stream_receiver.cc
index 6064e6971557932d3cd8ffea8bb6cf680ca68af4..970c1993392034858502c7fd3c1148039728181b 100644
--- a/webrtc/video/rtp_video_stream_receiver.cc
+++ b/webrtc/video/rtp_video_stream_receiver.cc
@@ -596,7 +596,7 @@ bool RtpVideoStreamReceiver::DeliverRtcp(const uint8_t* rtcp_packet,
   return true;
 }
 
-void RtpVideoStreamReceiver::FrameContinuous(uint16_t picture_id) {
+void RtpVideoStreamReceiver::FrameContinuous(int64_t picture_id) {
   if (!nack_module_)
     return;
 
@@ -611,7 +611,7 @@ void RtpVideoStreamReceiver::FrameContinuous(uint16_t picture_id) {
     nack_module_->ClearUpTo(seq_num);
 }
 
-void RtpVideoStreamReceiver::FrameDecoded(uint16_t picture_id) {
+void RtpVideoStreamReceiver::FrameDecoded(int64_t picture_id) {
   int seq_num = -1;
   {
     rtc::CritScope lock(&last_seq_num_cs_);