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This will simplify future refactoring where QuarantineFile() is moved to
an OOP service but not IsFileQuarantined().

This CL includes no functional change.

Bug: 870998
Change-Id: Ic30bf70b119e37de88baa374a4791678df80d393
Reviewed-on: https://chromium-review.googlesource.com/1228782Reviewed-by: Asanka Herath <asanka@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592963}