This reverts commit 4de2be99.

Reason for revert: Testing stops too early now, e.g. here after 2 min:
https://build.chromium.org/p/client.v8.clusterfuzz/builders/V8%20NumFuzz/builds/32

Original change's description:
> [test] Move timeout control to timeout processor
> 
> Bug: v8:6917
> Change-Id: I03be38be952f0d59eb20fa98102ef09ca795de40
> Reviewed-on: https://chromium-review.googlesource.com/883446
> Commit-Queue: Michał Majewski <majeski@google.com>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#50848}

TBR=machenbach@chromium.org,sergiyb@chromium.org,majeski@google.com

Change-Id: I6a925866476c69b3b50aa08e99facca0eaaa396b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6917
Reviewed-on: https://chromium-review.googlesource.com/884082Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50851}