This lets us remove stringstreams from common_audio/ Bug: webrtc:8982 Change-Id: I450d87dc50090e838edabc7c1db645aca9c1b0f7 Reviewed-on: https://webrtc-review.googlesource.com/82163 Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23609}