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Generate DIR_METADATA files and remove metadata from OWNERS files for
//components/polic

Change-Id: I997f3ab15d694f1e8a18e415ea70b2b75ce84b65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554297Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Norman Rosas <normando@google.com>
Cr-Commit-Position: refs/heads/master@{#831071}