Add a few more confusable map entries

1. Map Malaylam U+0D1F to 's'.
2. Map 'small-cap-like' Cyrillic letters to "look-alike" Latin lowercase
letters.

The characters in new confusable map entries are replaced by their Latin
"look-alike" characters before the skeleton is calculated to compare with
top domain names.

Bug: 784761,773930
Test: components_unittests --gtest_filter=*IDNToUni*
Change-Id: Ib26664e21ac5eb290e4a2993b01cbf0edaade0ee
Reviewed-on: https://chromium-review.googlesource.com/805214
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521648}