Remove lastest_revived_packet from QuicAckFrame since FEC is gone. No functional change expected.

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index eafe75a584cad6383708c4fd349826ddc1a2dc9f..4eef7ba1f85d6f7bcced642b491d8cee11c52f45 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -321,12 +321,6 @@ void QuicSentPacketManager::HandleAckForSentPackets(
     }
     MarkPacketHandled(packet_number, &(*it), ack_delay_time);
   }
-
-  // Discard any retransmittable frames associated with revived packets.
-  if (ack_frame.latest_revived_packet != 0) {
-    MarkPacketNotRetransmittable(ack_frame.latest_revived_packet,
-                                 ack_delay_time);
-  }
 }
 
 bool QuicSentPacketManager::HasRetransmittableFrames(