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This reverts commit 4252f96c.

Reason for revert: Still flaking on linux-chromeos-chrome
https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/4159

Original change's description:
> Settings: Try re-enabling SiteList test
> 
> Polymer 3 migration CL at:
> https://chromium-review.googlesource.com/c/chromium/src/+/2109410
> fixed a few issues in these tests. Try re-enabling them to see if they
> are still flaky on all platforms with the updates.
> 
> Bug: 929455
> Change-Id: I1efce24ce8b7c504379d43aa6ece5cb17896318d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2112241
> Reviewed-by: dpapad <dpapad@chromium.org>
> Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#752238}

TBR=dpapad@chromium.org,rbpotter@chromium.org

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

Bug: 929455
Change-Id: If714becda68b234d121e809f29c18016673d943a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2113593Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752352}