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Revert of Implement unit test specific test launcher timeout (patchset #6 of https://codereview.chromium.org/476543004/)

Reason for revert:
Multiple tests are timing out on dbg bots.

Original issue's description:
> Implement unit test specific test launcher timeout
>
> BUG=402213

TBR=jam@chromium.org,dalecurtis@chromium.org,rileya@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=402213

Review URL: https://codereview.chromium.org/504813003

Cr-Commit-Position: refs/heads/master@{#291682}