Follow-up of https://webrtc-review.googlesource.com/c/src/+/153220, where during code review it was suggested to move webrtc::MinPositive out of the api/ directory. Bug: None Change-Id: I0c3b87a9ffd1cd205a85dddd9f44cfd95eb02206 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153480 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29220}