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This change adds a test that create and then remove a
persistent-usage-record session and verifies that the record of key
usage is present in the license-release message and are both 'null'

Bug: 1102976
Change-Id: I766a3104d84b1e477e54c65f30e62aa5645bd426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308173
Commit-Queue: Alex St-Onge <alstonge@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790657}