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The Instance ID is the primary identifier for devices using v2
DeviceSync. This ID is not present in v1 DeviceSync, which used the
device public key as the primary ID. The device public key is encrypted
in v2 DeviceSync and might not be available during multi-device setup.

Bug: 951969
Change-Id: I09c1ebd6016d651deabb7eca6356581c3c69c0fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882300
Commit-Queue: Josh Nohle <nohle@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710966}