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This CL adds the ability to compare navigated domain against engaged sites using
edit distance. It also moves around some code without making functional changes.

Bug: 942160
Change-Id: I8d0de1f6cebfb10fefef2e379a84e3818d759daa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1555004
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649693}