BUG=webrtc:7903 Change-Id: I0325725be354ab89cfce1d3564936fe5ff93d303 Reviewed-on: https://chromium-review.googlesource.com/559339 Reviewed-by: Tommi <tommi@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Commit-Queue: Minyue Li <minyue@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19560}