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(Accessors like |GetUnsigned| will crash if the type of the value is
anything unexpected.)

Change-Id: Ic7c5e0971b00e2c566d32b18efc620780ee7c96d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636649
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666293}