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This reverts commit 0a5685cf.

Reason for revert: crbug.com/908297
Looks like LSAN spotted a leak around CloudExternalDataManagerBase

Original change's description:
> Fetch External Policy for Device Settings.
> 
> Add support for External Data referenced by Device Policy.
> Use the new support to implement the DeviceNativePrinters policy.
> Add browser test verifying external data cache is cleaned up after policy was changed or removed.
> 
> Bug: 807068
> Change-Id: Ib98778a438e929a78214d1d9ab066a41a6bdcf09
> Reviewed-on: https://chromium-review.googlesource.com/c/1335592
> Commit-Queue: Nikita Podguzov <nikitapodguzov@google.com>
> Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
> Reviewed-by: Sean Kau <skau@chromium.org>
> Reviewed-by: Sergey Poromov <poromov@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610596}

TBR=emaxx@chromium.org,skau@chromium.org,poromov@chromium.org,nikitapodguzov@google.com

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

Bug: 807068
Change-Id: Id4748ce53ded280f54b02c0dc85c23fe6fd41975
Reviewed-on: https://chromium-review.googlesource.com/c/1350435Reviewed-by: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610759}