Enable ChromeLauncherControllerWithArcTest.ArcAppPinPolicy test

This reverts commit 7476d68c11f66e8eb4e472eb594bbd55f002124b.

Reason for revert: The cause of test flakiness was fixed in
https://crrev.com/c/1092851.

Original change's description:
> Disable flaking ChromeLauncherControllerWithArcTest.ArcAppPinPolicy
> 
> ChromeLauncherControllerWithArcTest.ArcAppPinPolicy is flaking currently.
> Disabling as the team who owns the root cause is OOO.
> 
> TEST=ChromeLauncherControllerWithArcTest.ArcAppPinPolicy
> TBR=skuhne@chromium.org
> 
> Bug: 839916
> Change-Id: I86209df361ab53cb84225363c39b1c83db197a2f
> Reviewed-on: https://chromium-review.googlesource.com/1044655
> Reviewed-by: Jonathan Ross <jonross@chromium.org>
> Commit-Queue: Jonathan Ross <jonross@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#556125}

TBR=skuhne@chromium.org,jonross@chromium.org

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

Bug: 839916
Change-Id: I36936a7a97b04857a20d892a636f6aac98bc04b2
Reviewed-on: https://chromium-review.googlesource.com/1122796
Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571902}
1 file changed