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Retrieve either policy_common_defintions, or chrome_device_policy
proto file, which contains the definition of the message for
each of the device policy messages definition, to be able to use
the messages definition of policy_common_definitions inside
chrome_device_policy.

Bug: 552439
Change-Id: I319ac40b157d6fac281f2cd5ad18bed048bbb861
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847336
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704149}