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This reverts commit e93874be.

Reason for revert: http://crbug.com/863954#c3

Original change's description:
> [AF] Do not discard form data after dynamic form submission
> 
> Prior to this change form data were being discarded after a dynamic form
> submission. This was because the dynamically changed form was being added
> to the cache with its user entered/autofilled values. At the time of
> submission, form data were being discarded as they were thought to be the
> initial values of the fields at page load. This CL changes
> AutofillHandler::OnFormsSeen (which is called on dynamic form changes) to
> attempt to find a previously cached version of the form first. Prior to
> addition to the cache, form values are overridden by the cached values.
> This prevents those values from getting confused with the initial form
> values at the time of submission.
> 
> Bug: 863954
> 
> Change-Id: Iba4771ee87b9777e66a6b10b6b369379dc123a46
> Reviewed-on: https://chromium-review.googlesource.com/1137021
> Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
> Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#577033}

TBR=sebsg@chromium.org,mahmadi@chromium.org

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

Bug: 863954
Change-Id: I71d0970d10fe1d4857e98ba558b9253b13ad053d
Reviewed-on: https://chromium-review.googlesource.com/1151911Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579858}