Remove unused function QuicSentPacketManager::set_peer_max_ack_delay()

PiperOrigin-RevId: 824741017

quiche/quic/core/quic_sent_packet_manager.h

diff --git a/quiche/quic/core/quic_sent_packet_manager.h b/quiche/quic/core/quic_sent_packet_manager.h
index b51d804..e7dae0e 100644
--- a/quiche/quic/core/quic_sent_packet_manager.h
+++ b/quiche/quic/core/quic_sent_packet_manager.h
@@ -444,14 +444,6 @@
 
   QuicTime::Delta peer_max_ack_delay() const { return peer_max_ack_delay_; }
 
-  void set_peer_max_ack_delay(QuicTime::Delta peer_max_ack_delay) {
-    // The delayed ack time should never be more than one half the min RTO time.
-    QUICHE_DCHECK_LE(
-        peer_max_ack_delay,
-        (QuicTime::Delta::FromMilliseconds(kMinRetransmissionTimeMs) * 0.5));
-    peer_max_ack_delay_ = peer_max_ack_delay;
-  }
-
   const QuicUnackedPacketMap& unacked_packets() const {
     return unacked_packets_;
   }