Passing an empty arg is working at the moment but it is not guaranteed to continue to work in the future. Bug: None Change-Id: I975bc8779bac9700854de411301415338dcaf9f6 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/154820 Reviewed-by: Stefan Holmer <stefan@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29343}