std::is_trivially_* is not available on certain old STL implementations. Using absl implementation will allow maximized compatibility. Bug: webrtc:10054 Change-Id: I17ed0fff44328b3d7c51d14e8c4470f1df0e66ad Reviewed-on: https://webrtc-review.googlesource.com/c/111728 Commit-Queue: Jiawei Ou <ouj@fb.com> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Qingsi Wang <qingsi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25788}