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This reverts commit 8ee0e773.

Reason for revert: Performance regression (Bugs: 1006176, 1005678, 1005677, 1005248, 1005068, 1005066, 1006178, 1006071)

Original change's description:
> [Partition Alloc] Probabilistically poison memory on free.
> 
> We do it unconditionally in DCHECK builds to catch bugs, but let's occasionally
> do it in release builds too. Frequency is tunable.
> 
> This is a re-land of
> https://chromium-review.googlesource.com/c/chromium/src/+/1761578, which was
> reverted in https://chromium-review.googlesource.com/c/chromium/src/+/1797642.
> 
> Bug: 984742
> TBR: haraken
> Change-Id: I8f9a36389b2d58f6a11b324b59dd47727e4b91fb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808181
> Reviewed-by: Chris Palmer <palmer@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Commit-Queue: Chris Palmer <palmer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#697013}

TBR=palmer@chromium.org,haraken@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 984742
Change-Id: Ica990f0b07ac74034e049bcd507cc7d515429057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824074Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Chris Palmer <palmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699590}