Use std::pow instead of ::pow. Bug: None Change-Id: Ia08921312e8fc7f82edc859a2d598468c5f2b66a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/128081 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27173}