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U+04CF (ӏ) has the confusability skeleton of 'i' (lowercase
I), but it can be confused for 'l' (lowercase L) or '1' (digit) if rendered
in some fonts.

If a host name contains it, calculate the confusability skeleton
twice, once with the default mapping to 'i' (lowercase I) and the 2nd
time with an alternative mapping to 'l'. Mapping them to 'l' (lowercase L)
also gets it treated as similar to digit 1 because the confusability
skeleton of digit 1 is 'l'.

Bug: 817247
Test: components_unittests --gtest_filter=*IDN*
Change-Id: I7442b950c9457eea285e17f01d1f43c9acc5d79c
Reviewed-on: https://chromium-review.googlesource.com/974165
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Eric Lawrence <elawrence@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551263}