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This reverts commit 5b0cb536.

Reason for revert: find it identified flakes, I'll investigate on Monday

Original change's description:
> [TaskScheduler] Label SchedulerWorker threads stacks with an identifying frame
> 
> I intentionally didn't add "Foreground" to non "Background" workers as
> they may be used for background tasks in some configurations and I don't
> want it to be confusing for developers.
> 
> R=​fdoray@chromium.org
> 
> Bug: 839525
> Change-Id: I8c1e928914aa6d2e35fedc1db4e8a639d39116b2
> Reviewed-on: https://chromium-review.googlesource.com/1044501
> Commit-Queue: Gabriel Charette <gab@chromium.org>
> Reviewed-by: François Doray <fdoray@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#556169}

TBR=gab@chromium.org,fdoray@chromium.org

Change-Id: I660f43ba88eade2ac3e8fedf4d60495eab708054
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 839525
Reviewed-on: https://chromium-review.googlesource.com/1045747Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556306}