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This CL updates Http2Random to use unsigned integers consistently, in
hopes of being platform-agnostic (see, e.g.,
https://crrev.com/c/1310613).

This CL lands server changes 221087569 by bnc and 221279592 by diannahu.

Change-Id: Ifb1ea404887ab46569572a27b0c61c7e1bf1a26f
Reviewed-on: https://chromium-review.googlesource.com/c/1334009Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Dianna Hu <diannahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607736}