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This reverts commit e17dbaf1.

Reason for revert: Compile failure https://crbug.com/852958

Original change's description:
> Make base::ScopedZxHandle a zx::handle.
> 
> - Add the ScopedZxHandle APIs to the base zx::handle.
> - Add missing includes.
> 
> This allows ScopedZxHandle to be removed incrementally from call-sites.
> 
> Bug: 852541
> Change-Id: Idc452a450ce2bbe1266e9e0ee266115e2ea38f97
> Reviewed-on: https://chromium-review.googlesource.com/1100132
> Commit-Queue: Wez <wez@chromium.org>
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#567382}

TBR=wez@chromium.org,gab@chromium.org,rockot@chromium.org,kmarshall@chromium.org

Change-Id: I44b3be92d12a29a972ca3c59d3356f97b21292f2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 852541
Reviewed-on: https://chromium-review.googlesource.com/1101777Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567416}