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Use uniform_int_distribution in a way that Windows allows.

Bug: 891867
Change-Id: I7a9cf5c213ddfc8ca83efa29757674eea54a1c44
Reviewed-on: https://chromium-review.googlesource.com/c/1260162
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596424}