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Switch to PartitionAlloc for malloc() on Android. According to dev
experiments, this is either neutral or a win for memory, performance and
stability, with the exception of median GPU process footprint, which
regresses by a small amount, but is being addressed.

Note to sheriffs: If something breaks in this range on Android, this CL
                  is a likely culprit.

Note to perf sheriffs: This is expected to move a lot of performance
                       metrics, in both directions.

For details, see linked bugs, and for performance data from experiments,
https://docs.google.com/document/d/1asZy8Dy0m97AECTTU2jTbgwc-mwI9BLOMVYKKiQAp04/edit
(Google internal).

Bug: 1121427, 998048
Change-Id: Ice8d5c65e814a3086d121f8e8641f874d6b9e68b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625869
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843120}