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RemoteCommandsInvalidator and CloudPolicyInvalidator both use the same
InvalidationService instance, so migrate them together.

When fcm is enabled use command_invalidation_topic as topic to subscribe
to invalidations, and command_invalidation_name otherwise.

Bug: 939039
Change-Id: I4b77c60c0928dc3aa54a9e306182e2848354e1ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1658790Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Ivan Šandrk <isandrk@chromium.org>
Commit-Queue: Askar Aitzhan <askaraitzhan@google.com>
Cr-Commit-Position: refs/heads/master@{#671649}