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These classes implement the behavior shared amongst all infobar modal
implementations.  The coordinator packages a modal view configured by
subclasses into a UINavigationController and presents it modally.  The
mediator conforms to InfobarModalDelegate and handles those callbacks.

Bug: 1030357
Change-Id: I2c20f8c545daa5038bcccca3c10d7a24a8b3d2b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995687
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731742}