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This reverts commit 34905419.

Reason for revert: Causes crash in tests on linux-chromeos-dbg.
First failing build:
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/20491

Original change's description:
> Add mock policy option to extension install mixin
> 
> Add an option to initialize ExtensionForceInstallMixin with a
> MockConfigurationPolicyProvider.
> Use this option in ForceInstalledAffiliatedExtensionApiTest.
> Add mixin support to ForceInstalledAffiliatedExtensionApiTest.
> 
> Bug: 1090941
> Change-Id: Ieea931c108e091679be607045f405b55f4186a57
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416453
> Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
> Reviewed-by: David Bertoni <dbertoni@chromium.org>
> Reviewed-by: Omar Morsi <omorsi@google.com>
> Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#808281}

TBR=emaxx@chromium.org,dbertoni@chromium.org,omorsi@google.com,fabiansommer@chromium.org

Change-Id: I1b888be0d90a6ef99ac4f9e6c431296062bdb5cc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1090941
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419237Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808391}