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Since M-78, external policies are initialized after CupsPrintersManager. It
causes a problem with Enterprise Printers, because BulkPrinterCalculators are
created during external policies initialization. Since M-78,
EnterprisePrintersProvider (started by CupsPrintersManager) cannot find
objects of BulkPrinterCalculators and always returns empty list of printers.
This patch solves this problem by changing the lifetime of
BulkPrintersCalculator. From now, each BulkPrintersCalculator is created by
the first object that asks for it.
Some unittests require that BulkPrintersCalculator are deleted at the end of
each unittest. The patch solving that problem is in CL:1836660.

BUG=chromium:1010289,chromium:1009062
TEST=on nautilus

Change-Id: Ie9b06f05a67f028204230b6b84162a058457fbd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838051Reviewed-by: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Piotr Pawliczek <pawliczek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703123}