(n/a) downgrade two quic_bugs to warning logs. not protected.

See b/157887769#comment6 for why this QUIC_BUG is triggered in tests.

PiperOrigin-RevId: 314566402
Change-Id: I91f29972553e6c1146485eed05bb5b8f4a800655

quic/core/congestion_control/bbr2_misc.cc

diff --git a/quic/core/congestion_control/bbr2_misc.cc b/quic/core/congestion_control/bbr2_misc.cc
index 90df9a0..cdd0cb5 100644
--- a/quic/core/congestion_control/bbr2_misc.cc
+++ b/quic/core/congestion_control/bbr2_misc.cc
@@ -110,7 +110,7 @@
   // b) all packets in |acked_packets| did not generate valid samples. (e.g. ack
   // of ack-only packets). In both cases, total_bytes_acked() will not change.
   if (prior_bytes_acked != total_bytes_acked()) {
-    QUIC_BUG_IF(sample.sample_max_bandwidth.IsZero())
+    QUIC_LOG_IF(WARNING, sample.sample_max_bandwidth.IsZero())
         << total_bytes_acked() - prior_bytes_acked << " bytes from "
         << acked_packets.size()
         << " packets have been acked, but sample_max_bandwidth is zero.";

quic/core/congestion_control/bbr_sender.cc

diff --git a/quic/core/congestion_control/bbr_sender.cc b/quic/core/congestion_control/bbr_sender.cc
index 9d1f3e1..89f8be2 100644
--- a/quic/core/congestion_control/bbr_sender.cc
+++ b/quic/core/congestion_control/bbr_sender.cc
@@ -430,7 +430,7 @@
   // ack-only packets). In both cases, sampler_.total_bytes_acked() will not
   // change.
   if (total_bytes_acked_before != sampler_.total_bytes_acked()) {
-    QUIC_BUG_IF(sample.sample_max_bandwidth.IsZero())
+    QUIC_LOG_IF(WARNING, sample.sample_max_bandwidth.IsZero())
         << sampler_.total_bytes_acked() - total_bytes_acked_before
         << " bytes from " << acked_packets.size()
         << " packets have been acked, but sample_max_bandwidth is zero.";