Honghai Zhang 20ac434010 Fix a test bot failure.
That was caused by https://codereview.webrtc.org/1581903002/

BUG=
R=pthatcher@google.com
TBR=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1587373002 .

Cr-Commit-Position: refs/heads/master@{#11260}
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