The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5642e6d44472614889c3778ddbeed07cb96e7c2b

commit 5642e6d44472614889c3778ddbeed07cb96e7c2b
Author: Olivier Robin <olivierrobin@chromium.org>
Date: Tue Nov 28 15:26:37 2017

[Autofill] Disambiguate forms with same names

Autofill relies on the identity
__gCrWeb.common.getFormElementFromIdentifier(
    __gCrWeb.common.getFormIdentifier(form)) === form.

This is not the case if multiple forms have the same name.
Do not use the name if it does not allow to access the form.

Bug: 788093
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I95e602a46736fdfd86aa3a4708eb0b062a470009
Reviewed-on: https://chromium-review.googlesource.com/786017
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519694}
[modify] https://crrev.com/5642e6d44472614889c3778ddbeed07cb96e7c2b/ios/chrome/browser/autofill/autofill_controller_js_unittest.mm
[modify] https://crrev.com/5642e6d44472614889c3778ddbeed07cb96e7c2b/ios/web/web_state/js/resources/common.js

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