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This reverts commit 261096cf.

Reason for revert: Speculative revert of this CL since it may be causing many test failures.  See issue 1038953.

BUG=1038953

Original change's description:
> Browser test to exercise DoH against external servers
> 
> This change adds a non-hermetic manual browser test to verify
> Chrome's DoH implementation against a handful of external
> DoH servers. The test loops through each server, and
> attempts to load a test URL. Fallback to Do53 is
> disabled, so a successful navigation indicates that DoH passed.
> 
> A new setter set_allow_network_access_to_host_resolutions has
> been added to BrowserTestBase to allow browser tests to opt-in
> to using the full host resolver stack (instead of the mock host
> resolver). This mode then invokes
> SetAllowNetworkAccessToHostResolutions() on the NetworkServiceTest
> interface to disable the test host resolver.
> 
> Bug: 1032710
> Change-Id: I8e9e029e69a9e8281adb23e55179d9dd94707ef5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1961006
> Commit-Queue: Kaustubha Govind <kaustubhag@chromium.org>
> Reviewed-by: Eric Orth <ericorth@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#727778}

TBR=sky@chromium.org,ericorth@chromium.org,kaustubhag@chromium.org,dalyk@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1032710
Change-Id: I1e7628f22b55f9a884926b05e47fff25e2368a27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1987274Reviewed-by: Donn Denman <donnd@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728374}