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The OverlayPresenter passed as an argument for the
OverlayPresentationContext API was not used by the implementation.  This
CL decouples the presentation context interface from OverlayPresenter.

Bug: none
Change-Id: Iefa20303f6b38d22240fb9f29f0c3ec6675cb55a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2069257
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745167}