The bot "Win (more_configs)" has spotted another unsafe type conversion. This CL is a follow-up of: - https://webrtc-review.googlesource.com/c/src/+/12921 - https://webrtc-review.googlesource.com/c/src/+/13122 - https://webrtc-review.googlesource.com/c/src/+/13622 Bug: chromium:759980 Change-Id: I9a4268e7ea938cc85376211b40767fd8465f37fd No-Try: True Reviewed-on: https://webrtc-review.googlesource.com/13623 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20381}