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- The |parent| field was removed from ListContactPeople because contacts
  are associated with an account and not a device.
- The GetDeviceState request/response protos were added to support the
  newly added RPC that checks if the user's contacts have changed since
  the device last uploaded contacts.

Bug: b/154861518
Change-Id: Ie573d84dfbb02b755c26fcc1e603c0a1dcb4b15e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370923Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801804}