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BookmarkPromoController is a helper for view objects that
currently displays UI via the dispatcher (eg, -showSignin:).
We want to extract presentation actions out of this
pseudo-view layer and into the VC layer.

Related to crrev.com/c/756362

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Id4a97c11f857a448fa8f51a50a3e2c06f4d0426a
Reviewed-on: https://chromium-review.googlesource.com/771698Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517110}