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This reverts commit 0532f223.

Reason for revert: Full launch needs to be rolled back and retried in a future milestone due to a bug. The experiment cleanup here was premature.

Original change's description:
> Enable "AsyncDns" feature by default on Android
> 
> Also clean up Android-specific experiment code, but leave the
> base::Feature.
> 
> Bug: 768874
> Change-Id: Ic7b81a878e3e81bc1a5c2c2fae242df23c5387ca
> Reviewed-on: https://chromium-review.googlesource.com/868077
> Reviewed-by: Ilya Sherman <isherman@chromium.org>
> Commit-Queue: Miriam Gershenson <mgersh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#529866}

TBR=isherman@chromium.org,mgersh@chromium.org

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

Bug: 768874, 805020
Change-Id: Ib67c727aef748b4e80714e6128c3bfbdc24d3544
Reviewed-on: https://chromium-review.googlesource.com/881206Reviewed-by: Miriam Gershenson <mgersh@chromium.org>
Commit-Queue: Miriam Gershenson <mgersh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531381}