Revert of Reset NACK/ACK list when parsing a new RTCP packet. The NACK/ACK frames/packets list need to be res…

media/cast/net/rtcp/rtcp_utility.cc

Index: media/cast/net/rtcp/rtcp_utility.cc
diff --git a/media/cast/net/rtcp/rtcp_utility.cc b/media/cast/net/rtcp/rtcp_utility.cc
index 33ac1b41c64023ce1b523d046f87d9d5e436f789..74af3a04fb45ab8b3998c185d80cafdcda4e49a4 100644
--- a/media/cast/net/rtcp/rtcp_utility.cc
+++ b/media/cast/net/rtcp/rtcp_utility.cc
@@ -291,8 +291,6 @@
   // Please note, this frame_id is still only 8-bit!
   cast_message_.ack_frame_id = last_frame_id;
 
-  cast_message_.missing_frames_and_packets.clear();
-  cast_message_.received_later_frames.clear();
   for (size_t i = 0; i < number_of_lost_fields; i++) {
     uint8_t frame_id;
     uint16_t packet_id;