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The overall project aims to expose CNAME aliases to the
SubresourceFilter to aid in ad tagging and blocking.

A previous CL added a base::Optional parameter to
net::ConnectJob::SetSocket and a getter and setter to net::Socket.

This change continues the plumbing by adding an accessor to
net::HttpBasicState as well as one to net::HttpStream.

All of HttpStream's derived classes receive trivial implementations
except for HttpBasicStream and WebSocketBasicHandshakeStream. SPDY and
QUIC support will come in later CLs.

Relevant tests:
net:net_unittests
out/Default/net_unittests --gtest_filter=*Dns*Alias*

Bug: 1151047
Change-Id: I8b38591e4b186ded8cb41f89571385eee9fe0aa6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563450
Commit-Queue: Cammie Smith Barnes <cammie@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838249}