Reland "Mac: re-enable ProcessReaderMac tests"

This reverts commit 6c93a08219833d3b004fd42d365d102104191c65.

Reason for revert: arm64 failures fixed in r1037792

Original change's description:
> Revert "Mac: re-enable ProcessReaderMac tests"
>
> This reverts commit fcfaa65c43a82febd60a38267ab7486f639b3bcc.
>
> Reason for revert: The tests are failing reliably
> https://ci.chromium.org/ui/p/chromium/builders/ci/mac11-arm64-rel-tests/8830/overview
>
> Original change's description:
> > Mac: re-enable ProcessReaderMac tests
> >
> > These were fixed in the Crashpad roll this CL depends on
> >
> > Bug: 1319307, 1268776
> > Change-Id: I6d237dd1e13598287b153a1e4790fe5c3e975f92
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3838843
> > Reviewed-by: Mark Mentovai <mark@chromium.org>
> > Commit-Queue: Leonard Grey <lgrey@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1036832}
>
> Bug: 1319307, 1268776
> Change-Id: I6b0db9550c715d196ba9759e853b60fac72bda5e
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3841766
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Owners-Override: Vasilii Sukhanov <vasilii@chromium.org>
> Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1036994}

Bug: 1319307, 1268776
Change-Id: Ic0e76245c7b62844f2d73b221d32924a01e0154b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3846630
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1038342}