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This reverts commit 9c5df46a.

Reason for revert: timing out tests

Original change's description:
> Enable a new SYSTEM background tracing mode.
> 
> This mode will allow us to set up a background scenario and deliver
> triggers to the system when something interesting is happening. Which
> will allow us to only upload traces that are of interest.
> 
> Bug: 979583
> Change-Id: Ic48ea08e3f9fafccaf045847cc0ddfa76d11611c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760736
> Commit-Queue: Avi Drissman <avi@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: oysteine <oysteine@chromium.org>
> Auto-Submit: Stephen Nusko <nuskos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#689563}

TBR=avi@chromium.org,oysteine@chromium.org,eseckler@chromium.org,nuskos@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 979583,997206
Change-Id: I51889cecfdc1ac392fb199b1a190b14880801e6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768981Reviewed-by: enne <enne@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690047}