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In some specific cases, the offset of the innermost abspos was off by
exactly one fragmentainer block size. This CL fixes the issue.

Bug: 1157086
Change-Id: I9ee621e11d7e411de56a8d8c3da1561d2eb1f7e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602442
Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Reviewed-by: Alison Maher <almaher@microsoft.com>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840252}