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This CL also componentizes the IDN spoof checker heuristic.

Change-Id: I674775cbe8dd19a2ca02551d2a72b39c782ffb82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315082
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791323}