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This CL actually makes use of the NUX modules in the onboarding welcome
page, instead of the placeholder pages. There will be follow-up CLs to style
them to mock.

Bug: 874151
Change-Id: Iac750fac5ec744e658770937adab69f0b81f8309
Reviewed-on: https://chromium-review.googlesource.com/c/1256010
Commit-Queue: Scott Chen <scottchen@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600098}