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A cheap way of saving a kilobyte of binary size by simply making some
fields narrower. This decreases the size of this from 20 bytes to
12 bytes per entry. 8 bytes could be done with some more intrusive
repacking, but there are diminishing returns.

Change-Id: If89d2025b6b374766d602cd7caafac5e675d4c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2243252
Commit-Queue: Owen Min <zmin@chromium.org>
Auto-Submit: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805383}