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Exposes a getter and setter for focus_source_ on OmniboxEditModel and
uses them directly to track the focus source (omnibox or fakebox),
instead of relying on a workaround for Linux and using caret visibility
as a proxy.

Bug: 807600
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I6e23c77ca7c8cac39e07cc45c351b076a9183d1c
Reviewed-on: https://chromium-review.googlesource.com/894325
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537350}