This fixes the counter inconsistencies while leaving the memory in an
inaccessible state.

Bug: chromium:724947
Change-Id: I431eb6fda84922a52dfb9380c6b482ada55bccee
Reviewed-on: https://chromium-review.googlesource.com/519164
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45647}