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After the last cleanup,
https://chromium-review.googlesource.com/c/chromium/src/+/2007285,
syntax check for policy template does not work as the newly
related ArgumentParser does not support taking type='string'.

Bug: 1032064
Change-Id: I2d0f87781f402bbf3867590ceeed8147743c4d71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022025
Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735386}