BUG=webrtc:7903 Change-Id: I819c9362671ca0b02c602d53e4dc39afdd8ec465 Reviewed-on: https://chromium-review.googlesource.com/555311 Commit-Queue: Minyue Li <minyue@webrtc.org> Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18899}