Add a content setting property to disable first-use popups.
Add a content setting property to disable first-use popups.

For reference:
http://developer.android.com/reference/android/provider/Settings.Secure.html#SKIP_FIRST_USE_HINTS

BUG=

Review URL: https://codereview.chromium.org/1869383004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#386713}

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