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Currently we just sort suggestions by relevance and keep the best of
several duplicates. This can remove allowed_to_be_default_match's.
This change keeps the best default match, if any, and in fact
promotes it to the best relevance of the non-default matches
(if it's better).

Bug: 542780
Change-Id: Ie53f10d421412c390259891290fa15a951a4a2e1
Reviewed-on: https://chromium-review.googlesource.com/1174860
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586033}