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This reverts commit a2a4e75d.

Reason for revert: [sheriff] a culprit for cronet_tests failing on multiple builders
See https://crbug.com/877355 for details.

Original change's description:
> Check that TaskScheduler is not leaked between tests, or test-cases.
> 
> - Move some APIs off of base::TestSuite, that we unnecessarily public.
> - Rename the various internal TestEventListeners to express purpose.
> - Add CheckForLeakedGlobals check, and DisableCheckForLeakedGlobals API.
>   The latter is called by the content::ContentTestSuiteBase, since the
>   various browser- and ui-tests running under that suite base run more
>   like the browser itself, and so are expected to let global singletons
>   leak.
> 
> Bug: 875486
> Change-Id: If749dfe8530abc4a5c13a840bbf8258d48c377c5
> Reviewed-on: https://chromium-review.googlesource.com/1182612
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Commit-Queue: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#585652}

TBR=sky@chromium.org,wez@chromium.org,gab@chromium.org

Change-Id: I906458f276100d9f924a0a78c7cca3a55bcb28b6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 875486
Reviewed-on: https://chromium-review.googlesource.com/1187982Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585680}