gfe-relnote: For QUIC BBR/BBRv2, move max ack height tracking to BandwidthSampler. BBR change protected by --gfe2_reloadable_flag_quic_track_ack_height_in_bandwidth_sampler. BBRv2 protected by existing --gfe2_reloadable_flag_quic_default_to_bbr_v2.

PiperOrigin-RevId: 262018910
Change-Id: I392d82737a85bdf7de6de5918f0b9ea43a653329

quic/core/congestion_control/bandwidth_sampler_test.cc

diff --git a/quic/core/congestion_control/bandwidth_sampler_test.cc b/quic/core/congestion_control/bandwidth_sampler_test.cc
index 750b14e..9e36bdc 100644
--- a/quic/core/congestion_control/bandwidth_sampler_test.cc
+++ b/quic/core/congestion_control/bandwidth_sampler_test.cc
@@ -32,7 +32,8 @@
 // A test fixture with utility methods for BandwidthSampler tests.
 class BandwidthSamplerTest : public QuicTest {
  protected:
-  BandwidthSamplerTest() : bytes_in_flight_(0) {
+  BandwidthSamplerTest()
+      : sampler_(/*max_height_tracker_window_length=*/0), bytes_in_flight_(0) {
     // Ensure that the clock does not start at zero.
     clock_.AdvanceTime(QuicTime::Delta::FromSeconds(1));
   }