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This CL improves edit distance lookalike matching by not warning on two
classes of matches that are commonly false positives:
 1. Numeric suffixes, such as domain1.tld and domain2.tld.
 2. First-character edits, such as domain.tld and xdomain.tld.

Bug: 1096309
Change-Id: I9cdf46060ef00949435c7429b86a835de796fb49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255025
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Livvie Lin <livvielin@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781349}