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This reverts commit 21349955.

Reason for revert: Very tentative revert (with apologies if it's completely wrong) for strange crashes in mini_installer tests: https://crbug.com/1159411

Original change's description:
> [PartitionAlloc] Use exponential backoff for periodic purge.
>
> Periodic purge should ideally not be scheduled at all when a process is
> fully idle from the allocator's standpoint, that is doesn't
> allocate. The current current scheme achieves that, with non-trivial
> complexity (including managing reentrancy in the allocator).
>
> Make the code simpler, by modulating purge frequency with exponential
> backoff, rather than the complex mechanism we have.
>
> Bug: 998048
> Change-Id: I7faa5b2bb8450e41dba1c6cbdc0f65cd2d9a1dec
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593373
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Commit-Queue: Benoit L <lizeb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#837539}

TBR=haraken@chromium.org,lizeb@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I1d47a0aaf1f66ca8be50934b99b5222a07289855
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 998048, 1159411
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595088Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837561}