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This is no longer in use. Previously, it was used by the data reduction
proxy. This was also the only code path that could race proxied and
direct connections, so removing it lets us slim down tests a bit.

Bug: 1109329
Change-Id: I463f55e02d67eeaa894375659dfb515df5b6ba84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324174Reviewed-by: David Schinazi <dschinazi@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792862}