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This CL makes AutocompleteMatch::duplicate_matches sorted from
best-to-worst.

It refactors the deduplication process by splitting the duplicate
preference sorting code into a comparator, and puts the relevance
upgrading logic into its own method in:
AutocompleteMatch::UpgradeMatchWithPropertiesFrom().

This CL is needed, because almost any re-duplication logic used for
Entity Suggest "plain" match (see bug) will need to sort the duplicates
from second-best to worst.

But this should also be a pretty beneficial change on its own for code
clarity.

Bug: 989232
Change-Id: I71f093fe69714ee491328a54e3e2238a3ecadbbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730598
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686474}