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If a form contains multiple fields with the same name, autofill
suggestions often fills only one.
The current resolution process keeps the value of the last element with
a given name (each value overrides the previous value).
This CLs make the resolution process to favor the non-empty value.
The filling will try to fill every fields with the same name with this
value.

Bug: 728374, 732360
Change-Id: I5c5c1635c59679a9823589e914c65bb734b3b505
Reviewed-on: https://chromium-review.googlesource.com/806162Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524721}