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Ranker also takes care of logging and deals with field trials internally.

Bug: 786472, 778468
Change-Id: Ie583616643ab8ad169df4739a4a18b81a950553f
Reviewed-on: https://chromium-review.googlesource.com/788331
Commit-Queue: Philippe Hamel <hamelphi@chromium.org>
Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524426}