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This reverts commit d7c1e86c.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 635829 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtL2Q3YzFlODZjMzNjNDIzMjJmMWQ0M2QwOTU3NmUyZjNjNDFhOGUyNDEM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.memory/Linux%20ChromiumOS%20MSan%20Tests/11520

Sample Failed Step: browser_tests

Original change's description:
> Delay querying for printers list until the policy file is parsed
> 
> A list of enterpise printers is not ready immediately after creation of
> CupsPrintersManager. It caused a problem for testing procedure since from the
> level of autotest_private_api we do not know if the final list is ready or
> there are still some ongoing calculations. A new method called
> OnEnterprisePrintersInitialized() was added to the observer of
> CupsPrintersManager to solve this issue. Also whole code related to
> enterprise printers were refactored, large part of functionality was moved
> from SyncedPrintersManager to new class EnterprisePrintersProvider. Classes
> ExternalPrintersPrefBridge and DeviceExternalPrintersSettingsBridge have been
> merged into one class called CalculatorsPoliciesBinder.
> 
> BUG=chromium:816996
> TEST=Tested on nautilus with the use of CL:1451591
> 
> Change-Id: I50745f18beacab213216e5f367db0d023190e9e4
> Reviewed-on: https://chromium-review.googlesource.com/c/1220547
> Commit-Queue: Piotr Pawliczek <pawliczek@chromium.org>
> Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
> Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
> Reviewed-by: Sean Kau <skau@chromium.org>
> Auto-Submit: Piotr Pawliczek <pawliczek@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#635829}

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
BUG=chromium:816996

Change-Id: I03bae898e61c3107977268bf33d1582fe6eacb81
Reviewed-on: https://chromium-review.googlesource.com/c/1491134
Cr-Commit-Position: refs/heads/master@{#635900}