Simply use int64_t instead of int32_t for two local variables. This avoids integer-overflow in some rare cases. Bug: chromium:784216 Change-Id: Ie96835d6dc04e338b157469b74ead29e8bd403dd Reviewed-on: https://webrtc-review.googlesource.com/26580 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21141}