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This class will be reused by Weblayer. //chrome deps have been cleaned
in a preceding CL, so the componentization is straightforward.

We will put the ConfirmInfoBar C++ object in the infobars namespace in
a followup.

Bug: 1099169
Change-Id: I38de225f93bfc5545febc9ce9061259cf1b9f8d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2270566
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783886}