Roll src/net/third_party/quiche/src/ 6b7aa8bce..70ee9bcd3 (4 commits)

https://quiche.googlesource.com/quiche.git/+log/6b7aa8bce3fd..70ee9bcd3c1c

$ git log 6b7aa8bce..70ee9bcd3 --date=short --no-merges --format='%ad %ae %s'
2020-05-01 renjietang Update QUIC tests setup.
2020-05-01 bnc gfe-relnote: n/a.  Remove obsolete comment from test.
2020-04-30 dschinazi Introduce single-parameter variant of QuicConfig::SetIdleNetworkTimeout
2020-04-30 renjietang Turn on TLS1.3 for some QuicSpdyClientSessionTest.

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

Change-Id: Icdfaa5c16921065a5497f3fea09600a625b177d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2173867
Commit-Queue: Nick Harper <nharper@chromium.org>
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Auto-Submit: Nick Harper <nharper@chromium.org>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#764749}

• DEPS[diff]