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This reverts commit e29c70f6.

Reason for revert: This CL is likely the cause of a tree closure for failing to compile in build ios-device (https://ci.chromium.org/p/chromium/builders/ci/ios-device/173021)

Original change's description:
> feat: detect support for MTE and BTI
>
> MTE and BTI are Armv8.5-A features which help memory safety and
> control-flow integrity. This CL adds support for detecting them
> using the AT_HWCAP2 Linux API.
>
> MTE contains new instructions which will crash older cores. base::CPU
> can now be used to tell whether these instructions are safe to
> execute and adds a test to verify this. This does not test whether
> MTE is configured correctly to give any security properties, a
> subsequent CL will add tests for this.
>
> Bug: 1145581, 1137393
> Change-Id: I9abd66af1c1bdbf49eebd17f225a59b0a6cdfd33
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526738
> Commit-Queue: Richard Townsend <richard.townsend@arm.com>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#831180}

TBR=dcheng@chromium.org,haraken@chromium.org,richard.townsend@arm.com

Change-Id: Iccd79d592321a0d6ca387a3564016999fd660234
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1145581
Bug: 1137393
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560078Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831187}