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This is a reland of 90cc207c

Original change's description:
> [iOS] Add lookalike_url_egtest and update comments
>
> Bug: 1058898
> Change-Id: I80883ee1258493eb0ac56950d654606c393ee65e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284144
> Commit-Queue: Livvie Lin <livvielin@chromium.org>
> Reviewed-by: Eugene But <eugenebut@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#788917}

Bug: 1058898
Change-Id: Id68637bccd15735173bfea3ae41f91ad0ed39f58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307611Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790027}