relnote: Remove unused QuicClock member of BbrSender.

net/quic/core/congestion_control/send_algorithm_interface.cc

Index: net/quic/core/congestion_control/send_algorithm_interface.cc
diff --git a/net/quic/core/congestion_control/send_algorithm_interface.cc b/net/quic/core/congestion_control/send_algorithm_interface.cc
index bc44de09840be6fb60bd303d7ba484c8a65ad1ae..badfd2b14369e5e551a6b22500d958834a65ce9e 100644
--- a/net/quic/core/congestion_control/send_algorithm_interface.cc
+++ b/net/quic/core/congestion_control/send_algorithm_interface.cc
@@ -28,7 +28,7 @@ SendAlgorithmInterface* SendAlgorithmInterface::Create(
   switch (congestion_control_type) {
     case kBBR:
       if (FLAGS_quic_allow_new_bbr) {
-        return new BbrSender(clock, rtt_stats, unacked_packets,
+        return new BbrSender(rtt_stats, unacked_packets,
                              initial_congestion_window, max_congestion_window,
                              random);
       }