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This reverts commit a4dd23fd.

Reason for revert: https://bugs.chromium.org/p/chromium/issues/detail?id=1004879

Original change's description:
> [base] Ensure that tests don't change the thread priority.
> 
> This CL verifies that the thread priority is normal when a test process
> is launched and before/after each test. The goal is to avoid having
> tests that assume they run at normal priority be disabled because of
> other misbehaving tests (e.g. https://crbug.com/931706).
> 
> Bug: 931706
> Change-Id: I5ca18b87720b5305285be481f7b60ff5c941a324
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804786
> Commit-Queue: Scott Violet <sky@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Auto-Submit: François Doray <fdoray@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#697261}

TBR=sky@chromium.org,gab@chromium.org,thakis@chromium.org,fdoray@chromium.org,michaelpg@chromium.org,eseckler@chromium.org

Change-Id: I900562585a34cd92a4f49a215d7c323706ce468d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 931706,1004879
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808814Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697316}