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In preparation for componentization of this class for sharing with
WebLayer, this CL cleans it of //chrome dependencies. We do so by
introducing a simple ChromeConfirmInfoBar convenience subclass that
glues ConfirmInfobar to //chrome, which will then enable ConfirmInfobar
itself to be componentized and reused by WebLayer. Note that any
//chrome-level subclasses of ChromeConfirmInfoBar could still easily
be componentized if desired in the future by simply changing them to
subclass from ConfirmInfoBar directly and take in the needed additional
parameters in *their* constructors for supplying by the embedder.

Bug: 1099169
Change-Id: I20b57b37eec57ed9932c6a3610f64e3860ac2900
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2272323
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783855}