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This reverts commit 99391f02.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [PartitionAlloc] Don't poison memory on free.
> 
> It might? be the cause of a perf regression.
> 
> Bug: 882471,680657
> Change-Id: Iec34a348426ccfdf5864a3b2cbe0c377da20ac0e
> Reviewed-on: https://chromium-review.googlesource.com/1220468
> Commit-Queue: Chris Palmer <palmer@chromium.org>
> Reviewed-by: Emil A Eklund <eae@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#590508}

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

Change-Id: I6c687b8cb2b8aa0bc3de682c1c39f430b1f6b05c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 882471, 680657
Reviewed-on: https://chromium-review.googlesource.com/1220815Reviewed-by: Chris Palmer <palmer@chromium.org>
Commit-Queue: Chris Palmer <palmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590545}