Revert of Re-enable swarming on Android content_browsertests. (patchset #2 id:20001 of https://chromiumcodereview.appspot.com/1737763004/ )
Revert of Re-enable swarming on Android content_browsertests. (patchset #2 id:20001 of https://chromiumcodereview.appspot.com/1737763004/ )

Reason for revert:
still seeing elevated execution times

NOTRY=true

Original issue's description:
> Re-enable swarming on Android content_browsertests.
>
> BUG=525873
>
> Committed: https://crrev.com/aab21cbcda7d71f8ea7103e7dceb414b9280173d
> Cr-Commit-Position: refs/heads/master@{#378043}

TBR=jbudorick@chromium.org,dpranke@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=525873

Review URL: https://codereview.chromium.org/1747953002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#378271}

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