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This reverts commit 2ae89dce.

Reason for revert: net_unittests seems to be consistently failing after your patch landed. First failure is here: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/ios-simulator/35922 . net_unittests hangs when it gets to MultiThreadedProxyResolverTest.CancelCreate

Original change's description:
> Change ProxyResolutionService API to use std::unique_ptr<Request> instead of raw pointers.
> 
> Bug: 479898
> Cq-Include-Trybots: luci.chromium.try:linux_mojo
> Change-Id: I3d1b89fc33ebae27f6ab4007eceffb9eb6134ef6
> Reviewed-on: https://chromium-review.googlesource.com/887598
> Commit-Queue: Matt Menke <mmenke@chromium.org>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Reviewed-by: Bo <boliu@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#578436}

TBR=stevenjb@chromium.org,sky@chromium.org,eroman@chromium.org,boliu@chromium.org,mef@chromium.org,mmenke@chromium.org,lilyhoughton@chromium.org

Change-Id: I17026b358225cc01884be96ca5b69dcd9f885e5d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 479898
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/1152368Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578474}