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This is to prepare for a following CL to move all the components/nux/
backend code to chrome/browser/ui/webui/welcome/. The decision to move
components/nux/ to  chrome/browser/ui/webui/welcome/ is based on the fact
that nux is only ever going to be used in webui and exclusively within the
welcome flow.

Bug: 874122
Change-Id: I873047c06dc76f14c4d9affb5c3829dc0f4b5e18
Reviewed-on: https://chromium-review.googlesource.com/1229333
Commit-Queue: Scott Chen <scottchen@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594486}