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The default search engine (DSE) list is being refreshed from recently
collected data.  This CL is focusing first on countries for which a
DSE list is already in place.  Existing engine registrations will be
kept intact, and only new engines are being added.  The list of engine
references for each country is being completely replaced based on new
usage statistics, and unreferenced engine registrations are removed.

Bug: 783890
Change-Id: Ie13eaa91d4a62eb581375f6dc00c556c7c536885
Reviewed-on: https://chromium-review.googlesource.com/c/1345542Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615987}