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This CL adds a new enum (IDNSpoofChecker::Result) and returns it from
IDN spoof checking code. This result will then be used to convert
some punycode fallback cases to other types of UI (interstitials or
safety tips).

Bug: 1095120
Change-Id: I68c1b3c639edc3f71a0f2c4d3d5adbce7a689c9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246833
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779095}