Remove max_ack_delay_ in rttstats. this field is unused and should be removed when deprecating quic_sent_packet_manager_cleanup flag, and hence not flag protected.
PiperOrigin-RevId: 319771927
Change-Id: I6f973a27d266bce0f770436506dddf999e37dc64
QUICHE (QUIC, Http/2, Etc) is Google‘s implementation of QUIC and related protocols. It powers Chromium as well as Google’s QUIC servers and some other projects.