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This CL converts discover App flag to feature and enabled it by default.

Bug: 864686
Change-Id: Idf8dcce4982a16f92ed7b012525484963f799710
Reviewed-on: https://chromium-review.googlesource.com/c/1326221
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606633}