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This coordinator manages the BrowserContainerViewController, which
displays the main web page content view.  This is in preparation for
a new fullscreen implementation experiment where the container will
conform to FullscreenUIElement.  The coordinator can setup and tear
down FullscreenUIUpdaters for the BrowserContainerViewController upon
starting/stopping.

Bug: 836400
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I4054c279dcabe2a8f88ebb769ae40d1d15f07b67
Reviewed-on: https://chromium-review.googlesource.com/1026564Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553864}