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This CL adds lookalike heuristic checking to safety tips. A safety tip
is only triggered when a lookalike domain is identified, but an
interstitial would NOT be triggered. In practice, this means a safety
tip is triggered when:
 - there's an edit distance of 1 to a top or engaged domain, or
 - there's skeleton similarity to a non-top-500 top domain.

 This CL also tidies the logic in lookalikes slightly. Now
 Chrome identifies lookalikes first and as a separate step decides
 whether to display an interstitial. Both functions are used when
 determining whether to trigger a safety tip, so as interstitialling
 logic changes, safety tips will move out of the way appropriately.

 Bug: 984725, 996733

Change-Id: I590f6d707a5347d55fb48e71e1420434b14bccb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771940
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690940}