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This is one of a few of these types of warnings that I've found as I
continue my quest to get the battor_agent_unittests running on the
trybots.

TBR=zhenw@chromium.org,nednguyen@google.com
BUG=571458

Review URL: https://codereview.chromium.org/1642113002

Cr-Commit-Position: refs/heads/master@{#372089}