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This reverts commit 3fbdb522.

Reason for revert: failing on Mac10.10 and Mac10.11

Original change's description:
> [AF] GoogleBlue50 as Autofill's field preview bg color
>
> This basically reverts the experimentation scaffolding introduced by
> crrev.com/1174710, and makes GoogleBlue50 the field preview bg color
> for Autofill and Autocomplete.
>
> Bug: 935991
> Change-Id: Id821f57c5a2954d502ca241e4414fd452cc501ce
> Reviewed-on: https://chromium-review.googlesource.com/c/1489173
> Commit-Queue: Fabio Tirelo <ftirelo@chromium.org>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Reviewed-by: Tommy Martino <tmartino@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#636103}

TBR=tkent@chromium.org,tmartino@chromium.org,ftirelo@chromium.org

Change-Id: Id05bd9c4b40aa79130779d4602791678566d9c60
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 935991
Reviewed-on: https://chromium-review.googlesource.com/c/1492437
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636133}