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This CL updates OOBE Discover code to make it loadable as an app.

Bug: 864686
Change-Id: I1e9840041f193ce2d69e0defd34f2ab56f8dcbb1
Reviewed-on: https://chromium-review.googlesource.com/1186185
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586112}