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}