This fixes a build error on C++17 mode due to missing #include, plus adds a presubmit check to prevent further breakage. Bug: chromium:752720 Change-Id: I5c7d1dca0079dfe7a042650402e6f7ae28a797ba Reviewed-on: https://webrtc-review.googlesource.com/c/124940 Commit-Queue: Taiju Tsuiki <tzik@chromium.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26898}