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This reverts commit 5416e508.

Reason for revert: Likely culprit of Cast Audio Linux breakage: https://ci.chromium.org/p/chromium/builders/ci/Cast%20Audio%20Linux/75925

Original change's description:
> base/allocator: Respect malloc() alignment guarantees in PartitionAlloc.
> 
> Generally speaking, malloc() must return data suitably aligned for
> std::max_align_t. In practice this means 16 bytes on 64 bit
> architectures, whereas PartitionAlloc only provides 8 there. This is
> problematic to use it as a malloc() replacement.
> 
> This CL makes PartitionAlloc respect the alignment guarantees on 64 bit
> architectures.
> 
> Bug: 787153,998048
> Change-Id: I860f9d0439d59f8d494306452b8cdbff515c8300
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219498
> Commit-Queue: Benoit L <lizeb@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Takashi Sakamoto <tasak@google.com>
> Cr-Commit-Position: refs/heads/master@{#772662}

TBR=tasak@google.com,haraken@chromium.org,lizeb@chromium.org

Change-Id: Ic3266b40748d22cb25d91ab041db79da42851f4f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 787153, 998048
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220085Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772669}