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When testing with policy, we've noticed that it also receives user
policy with the same name. Which doesn't really makes sense in the
context of this policy. Because it updates ChromeOS which is common for
all users.

Bug: 932465
Change-Id: I50d54ad061ab834303b10d1fa54d11e31ad0743c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1605685Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Askar Aitzhan <askaraitzhan@google.com>
Cr-Commit-Position: refs/heads/master@{#659009}