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This reverts commit 3ca917bd.

Reason for revert: The CL caused crashes on Chrome canary on Mac: crbug.com/882787

Original change's description:
> [OSCrypt] Add feature for preventing key overwrites in Keychain on Mac
>
> This Cl includes:
> - Add a feature flag which is disabled by default.
> - Include key creation utility to prevent key overwrites in KeychainPassword::GetPassword().
> - Add tests for the above changes.
> - Register the local state early from the main thread in os_crypt.
>
> Bug: 791541
> Change-Id: I2a664cd285fe73b32a15b2949977b940d95e7bbe
> Reviewed-on: https://chromium-review.googlesource.com/1188318
> Commit-Queue: Tonko Sabolčec <tsabolcec@google.com>
> Reviewed-by: Christos Froussios <cfroussios@chromium.org>
> Reviewed-by: Dominic Battré <battre@chromium.org>
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#589898}

TBR=battre@chromium.org,vasilii@chromium.org,rsesek@chromium.org,cfroussios@chromium.org,tsabolcec@google.com

Change-Id: I1be5c8294985e81115a8856f4105fbff8a3a28a9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 791541
Reviewed-on: https://chromium-review.googlesource.com/1219086Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Tonko Sabolčec <tsabolcec@google.com>
Cr-Commit-Position: refs/heads/master@{#590270}