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HQP has a provider limit of 3. To make full use of the capacity, this CL
dedupes HQP matches.

The first attempt at HQP deduping (crrev.com/c/2219027) deduped matches
too early in the algorithm which could result in unintionally removing a
suggestion even if its duplicate suggestion would later be trimmed or
scored lower. This was reverted (crrev.com/c/2327955).

This CL implements deduping after trimming and scoring of HQP matches.

Bug: 591981
Change-Id: I27c418e2048c495d2622b7937f080792ba43acc5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2334819
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796639}