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This reverts commit c4f3b72d.

Reason for revert: Breaking network_service_out_of_process_chrome_public_test_apk, see http://crbug.com/1041822

Original change's description:
> Reland "Squash top level error code returned from host resolver."
> 
> This is a reland of 834f2092
> 
> Now not squashing ERR_NOT_IMPLEMENTED to avoid disrupting existing
> InProcessBrowserTests.
> 
> Original change's description:
> > Squash top level error code returned from host resolver.
> >
> > If the host resolution process fails, the top level error code should
> > now be only ERR_NAME_NOT_RESOLVED. A more specific error code (e.g.
> > ERR_CONNECTION_REFUSED if a secure mode DoH server was offline) may be
> > found in ResolveErrorInfo.
> >
> > Bug: 1016325
> > Change-Id: I9f5f857fffd71be6485d05280239cd0b649d7a8f
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974678
> > Commit-Queue: Katharine Daly <dalyk@google.com>
> > Reviewed-by: Matt Menke <mmenke@chromium.org>
> > Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> > Reviewed-by: Eric Orth <ericorth@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#728725}
> 
> Bug: 1016325
> Change-Id: If2d029ea94f1a85f95d641cf02e4283973316a98
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992191
> Reviewed-by: Eric Orth <ericorth@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Commit-Queue: Katharine Daly <dalyk@google.com>
> Cr-Commit-Position: refs/heads/master@{#730951}

TBR=jam@chromium.org,mmenke@chromium.org,ericorth@chromium.org,dalyk@google.com

Change-Id: I1d4d1c9b76c73a3762cfe739e5c99993579d1546
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1016325, 1041822
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001439Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731695}