relnote: Remove unused QuicClock member of BbrSender.

net/quic/core/congestion_control/bbr_sender.h

Index: net/quic/core/congestion_control/bbr_sender.h
diff --git a/net/quic/core/congestion_control/bbr_sender.h b/net/quic/core/congestion_control/bbr_sender.h
index 152d5ec9136b3dc86d008f734cb7e1c6b8869f99..ac329494be261230dee5d481b1a0280d973239d5 100644
--- a/net/quic/core/congestion_control/bbr_sender.h
+++ b/net/quic/core/congestion_control/bbr_sender.h
@@ -89,8 +89,7 @@ class QUIC_EXPORT_PRIVATE BbrSender : public SendAlgorithmInterface {
     bool last_sample_is_app_limited;
   };
 
-  BbrSender(const QuicClock* clock,
-            const RttStats* rtt_stats,
+  BbrSender(const RttStats* rtt_stats,
             const QuicUnackedPacketMap* unacked_packets,
             QuicPacketCount initial_tcp_congestion_window,
             QuicPacketCount max_tcp_congestion_window,
@@ -190,7 +189,6 @@ class QUIC_EXPORT_PRIVATE BbrSender : public SendAlgorithmInterface {
   // recovery.
   void CalculateRecoveryWindow(QuicByteCount bytes_acked);
 
-  const QuicClock* clock_;
   const RttStats* rtt_stats_;
   const QuicUnackedPacketMap* unacked_packets_;
   QuicRandom* random_;