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The QuicChromiumPacketReader upon finishing the socket read, will dereference
the socket to get local and peer addresses and report packet back to the
visitor unconditionally even if the connection is closed. The patch landed in
crrev.com/c/1900569 nulls out the socket upon connection close, leading to null
dereference when fetching local and peer addresses.

Bug: 1014092, 1021938
Change-Id: I9af79f03b3e2ffbe1ed036af8980efa6b6d1478c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901946
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Auto-Submit: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713287}