Roll src/net/third_party/quiche/src/ 6cccce4f5..faf8b0277 (7 commits)

https://quiche.googlesource.com/quiche.git/+log/6cccce4f5870..faf8b0277550

$ git log 6cccce4f5..faf8b0277 --date=short --no-merges --format='%ad %ae %s'
2020-06-08 renjietang For IETF QUIC client: When 0-RTT is rejected, check the server-sent transport params and close connection if server's limit exceeds what the client has already used.
2020-06-08 nharper Create a SessionCache for TLS resumption in QUIC HTTP EndToEndTest
2020-06-08 renjietang In IETF QUIC client: Delay retransmission of 0-RTT data to be after QuicSession config is set to the fresh server config.
2020-06-08 nharper Add support for accepting 0-RTT in TlsServerHandshaker
2020-06-08 danzh (n/a) open source quic gso batch writer. not protected.
2020-06-08 nharper Add SerializeTransportParametersForTicket
2020-06-08 fayang Deprecate gfe2_reloadable_flag_quic_change_default_encryption_level.

Created with:
  roll-dep src/net/third_party/quiche/src src/third_party/quic_trace/src

R=dschinazi@chromium.org

Change-Id: If3f80075dd3442026dd2e83d4de6fa190738e0ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2237769
Auto-Submit: Fan Yang <fayang@chromium.org>
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776582}

DEPS

@@ -309,7 +309,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'quiche_revision': '6cccce4f58708940e9a02462007ad6ed0fa019ff',
+  'quiche_revision': 'faf8b0277550de66bad3e6e562f54908969b6511',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ios_webkit
   # and whatever else without interference from each other.

net/quic/quic_flags_list.h

@@ -320,12 +320,6 @@ QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_tls_resumption, false)
 // When true, QUIC's BBRv2 ignores inflight_lo in PROBE_BW.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr2_ignore_inflight_lo, false)
 
-// If true, for QUIC + TLS, change default encryption level when new encryption
-// key is available.
-QUIC_FLAG(bool,
-          FLAGS_quic_reloadable_flag_quic_change_default_encryption_level,
-          true)
-
 // If true, do not change ACK in PostProcessAckFrame if an ACK has been queued.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_donot_change_queued_ack, true)