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This reverts commit 89f3899b.

Reason for revert: Feature has been launched, remove the fieldtrail testing

Original change's description:
> Add WebView UMA log package name to field trial testing config.
> 
> Bug: 839646
> Change-Id: I0b28b079bd5e44d8f8d9a6057d2740b4f6bc9bcb
> Reviewed-on: https://chromium-review.googlesource.com/c/1370373
> Reviewed-by: Mark Pearson <mpearson@chromium.org>
> Commit-Queue: Tao Bai <michaelbai@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#615807}

TBR=michaelbai@chromium.org,mpearson@chromium.org,holte@chromium.org

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

Bug: 839646
Change-Id: I029e6e719c509268b8c9aa624b459bc5590b5c3a
Reviewed-on: https://chromium-review.googlesource.com/c/1460445Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630631}