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with repetitive names. The correct form should get filled.

Problem:
1. When an element would go invalid, we would use the section of
elements as one of the hints to find the new version of the old
element in the refill, but only the section of the autofilled fields
were passed. This would break the refills when the visibility of a
field changes. => Set and pass section of all fields.
2. In finding the new version of the old element, the case with more
than two elements with the matching names were not considered.
3. There was a bug in the logic for the nameless forms.

Fixes: https://jsfiddle.net/parastoog/tnh8j9ws/, ~/ds5h7kg4/,
~/w81yc6La/

Bug: 900185
Change-Id: I26fda7a50b3beb7f7c484a697633ab3b7b5a76d8
Reviewed-on: https://chromium-review.googlesource.com/c/1336492
Commit-Queue: Parastoo Geranmayeh <parastoog@google.com>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609921}