Add a new QUIC common cert set to reflect the new GIA cert. Also rename the existing common cert set *.inc files. Merge internal change: 78450265 https://codereview.chromium.org/683343002/ Removes QuicTcpCongestionWindow type and adds a new QuicPacketCount type. The CL also moves to using QuicPacketCount instead of QuicTcpCongestionWindow in TCP congestion control code. Using a QuicPacketCount type makes it obvious for congestion control computations that a variable of this type needs to be converted when comparing with other congestion control variables (such as |bytes_in_flight|) that are maintained as QuicByteCount. As a type, QuicTcpCongestionWindow currently doesn't seem to have any other semantic value. Merge internal change: 78399967 https://codereview.chromium.org/644853004/ Fix flaky test in QuicSessionTest. Port of https://codereview.chromium.org/669963003/ to internal source tree. Merge internal change: 78351892 This CL was already in chromium except for small comment change. https://codereview.chromium.org/684783006/ Stop sending QUIC SCUP message immediately after handshake. Merge internal change: 78296626 https://codereview.chromium.org/684983002/ Delete rolled out FLAGS_quic_store_cached_network_params_from_chlo Merge internal change: 78276864 https://codereview.chromium.org/669663004/ Modifies RTT code to use uncorrected measured rtt for min_rtt and to only correct for ack_delay when recording smoothed_rtt and when ack_delay is sane. Merge internal change: 78269418 https://codereview.chromium.org/685893002/ Flag protect enabling of QUIC's BBR congestion control algorithm. Merge internal change: 78229291 https://codereview.chromium.org/687643004/ Further simplify QUIC's UnackedPacketMap now that the interface is unified on AddSentPacket. Merge internal change: 78219252 https://codereview.chromium.org/685883004/ R=rch@chromium.org, TBR=mkosiba@chromium.org, mnaganov@chromium.org Review URL: https://codereview.chromium.org/689483002 Cr-Commit-Position: refs/heads/master@{#301825}