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This is so that exporting of this functionality over mojo can accurately
express the underlying type and the kNoLimit constant. (Which doesn't
seem doable with size_t since its size, and therefore value of its max,
differs on different platforms).

Bug: 767450
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I741bfe1c942e5ee7752f346932a26e861cefb0c8
Reviewed-on: https://chromium-review.googlesource.com/1027905Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553891}