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The hooks' spinlock in PartitionAlloc is not performance-sensitive, and
is likely used as PartitionAlloc used not to rely on base/. Removing it
to reduce the use of custom locking (see the attached bug for
motivations).

Bug: 1061437
Change-Id: Id1d74ac9f108bdc462fd0d5586e89b0be056b67a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2102532
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750521}