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Runs PartitionAllocMemoryReclaimer for the PartitionRoot used by
ShimMalloc, etc. (partition alloc as malloc).

Change-Id: I636b7b2ca4fdda7de7b3a178e6193dea7c0605cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532476Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829063}