The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/50d31ff7487ef87dcd13afbee1adff2c8b750321

commit 50d31ff7487ef87dcd13afbee1adff2c8b750321
Author: Olivier Robin <olivierrobin@chromium.org>
Date: Mon Jun 04 09:44:36 2018

[Autofill iOS] Do not use id as form identifier if there is a collision

For a form f, if document.getElementById(f.id) !== f, we cannot use the
id as the form identifier.

Bug:  847796 
Change-Id: Ib8bb5f1f2e0f990034f2f775cfc398c77d4395ea
Reviewed-on: https://chromium-review.googlesource.com/1078730
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564037}
[modify] https://crrev.com/50d31ff7487ef87dcd13afbee1adff2c8b750321/components/autofill/ios/fill/resources/form.js