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This feature never worked as advertised. IPv4-mapped
addresses are a host-only concept. They never appear
on the wire. For example, if I open a TCP socket to
IPv6 address ::ffff:1.2.3.4 and port 443, my device
will send out an IPv4 packet with destination
address 1.2.3.4. It will not send an IPv6 packet.
IPv4-mapped IPv6 addresses exist to allow
applications to only use IPv6 but still work on
IPv4 networks. More details here:
https://tools.ietf.org/html/rfc4038#section-4.2

R=zhongyi@chromium.org

Change-Id: I4e9f349c1753aaab19dbaf040fa5d40a6a1740d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2204826
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Auto-Submit: David Schinazi <dschinazi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770778}