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This reverts commit 43d39c4b.

Reason for revert: Speculatively re-enable after  https://chromium-review.googlesource.com/c/chromium/src/+/1536801

Original change's description:
> Disabled BackgroundTracingManagerBrowserTest on Android.
> 
> Flaky on Android.
> 
> Bug: 945516
> Change-Id: I9566206394483cb11aebc029321d87f50ace1f29
> Tbr: dsinclair@chromium.org
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1538882
> Reviewed-by: Justin DeWitt <dewittj@chromium.org>
> Commit-Queue: Justin DeWitt <dewittj@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#644052}

TBR=dsinclair@chromium.org,dewittj@chromium.org

Change-Id: I8bd035f487c59500ba9b8dd90e8901f81b2349b7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 945516
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1540297Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644465}