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This change adds a finch feature that allows the Chrome Home promo
dialog to act as an information-only dialog that provides no option
to opt out -- it will only display on 'ok' button. This flag acts
independently of the other promo flags. The "ChromeHomePromo" flag
does not need to be enabled for "ChromeHomePromoInfoOnly" to trigger
the promo.

This version of the dialog will show on startup if:
- Chrome Home is enabled.
- Chrome Home has been enabled for < 60 seconds.
- The normal promo has not been seen before.

Outcome metrics are not recorded in this case.

BUG=789685

Change-Id: Ib8378ed86867275519aa78deb4240bd255a57939
Reviewed-on: https://chromium-review.googlesource.com/798122Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520705}