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This was showing up as a -Wconversion error on gcc, when used via
saturated_cast<int16_t>(...).

Change-Id: Ie643478c1678387ddc4b0386998c77bd74d92700
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008277Reviewed-by: Justin Schuh <jschuh@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734082}