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We already have USE_PARTITION_ALLOC_AS_MALLOC, which serves the same
purpose.

Change-Id: I689386a830115a4b1c5632b4e75639365e57d996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631893Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845028}