Revert "base: Disable some perf tests that are failing on Android"

This reverts commit 15a28138fef95c32556efa516aae023dfc6a47ed.

Reason for revert: The test timeout has been increased with https://chromium-review.googlesource.com/c/1353922, so let's see if these pass reliably now.

Original change's description:
> base: Disable some perf tests that are failing on Android
> 
> The following perf tests are often timing out on Android:
> 
> - JSONPerfTest.StressTest
> - ObserverListPerfTest/1.NotifyPerformance
> - ScheduleWorkTest.*
> 
> This patch disables them on Android until they are be investigated.
> 
> TBR=gab@chromium.org
> 
> Bug: 906686
> Change-Id: Iad78d71e1b3293a75834b06a2b7b4b13b7ac5e75
> Reviewed-on: https://chromium-review.googlesource.com/c/1349711
> Reviewed-by: Eric Seckler <eseckler@chromium.org>
> Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610618}

TBR=gab@chromium.org,skyostil@chromium.org,perezju@chromium.org,eseckler@chromium.org

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

Bug: 906686
Change-Id: I23a585253860366456fe7d8b7a27d5cd949840d9
Reviewed-on: https://chromium-review.googlesource.com/c/1377851
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616635}
3 files changed