Add trailing comma to fix typo.
Add trailing comma to fix typo.

BUG=525873
TBR=sievers@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1407133006

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#355024}

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