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|total_allocations_| is used after the mutex guarding it is released.
This CL reads its value before releasing the mutex, removing the race
condition.

Bug: 881875
Change-Id: Iba1539eb75012bb69bf2bd6631345fa9518a62cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098017
Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749175}