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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}