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The user needs to be able to opt out of Content Suggestions if needed.
Android is coupling the Omnibox suggestions and the Content suggestions
setting but it is probably clearer to have it separated.
However the names are misleading and need to be changed.

TEST= Toggle the switch Settings->Privacy->"Show Content Suggestions".
- When enabled the suggestions are shown as expected.
- When disabled, the remote suggestions("Articles for You") currently
  displayed are removed.
  When opening a new NTP the Articles for You section is empty.
The Reading List section is unaffected.

Bug: 751623
Change-Id: I076f2f25697741e6f351a90da500a6ef33b21bf1
Reviewed-on: https://chromium-review.googlesource.com/598069
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491384}