Roll src/net/third_party/quiche/src/ d8fb72d5a..e447bc609 (5 commits)

https://quiche.googlesource.com/quiche.git/+log/d8fb72d5ad9c..e447bc609047

$ git log d8fb72d5a..e447bc609 --date=short --no-merges --format='%ad %ae %s'
2020-08-27 fayang Neuter initial packet in the coalescer when discarding initial keys.
2020-08-27 fayang Deprecate gfe2_reloadable_flag_quic_update_packet_size.
2020-08-27 bnc Refactor GOAWAY-related accessors.
2020-08-26 dschinazi Add memory safety guard for QuicFrame
2020-08-26 dschinazi Add some QUIC DCHECKs

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

R=dschinazi@chromium.org

Change-Id: I66ddfd794c1ff4620603d9a954375686c0fae256
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380214
Commit-Queue: Victor Vasiliev <vasilvv@chromium.org>
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802401}

DEPS

@@ -322,7 +322,7 @@ 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': 'd8fb72d5ad9cb8ae3499b07b37b7857d88d26794',
+  'quiche_revision': 'e447bc6090479a4b89a2689768a8b05bafffe50c',
   # 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

@@ -453,3 +453,9 @@ QUIC_FLAG(bool,
 QUIC_FLAG(bool,
           FLAGS_quic_reloadable_flag_quic_start_peer_migration_earlier,
           false)
+
+// If true, neuter initial packet in the coalescer when discarding initial keys.
+QUIC_FLAG(
+    bool,
+    FLAGS_quic_reloadable_flag_quic_neuter_initial_packet_in_coalescer_with_initial_key_discarded,
+    true)