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Right now GetWebContents is done by first fetching GetWebUILoginView, which is
not available in LoginDisplayHostMojo; however, LoginDisplayHostMojo does have
an associated WebContents instance when it is hosting oobe in a dialog, so
return that.

Bug: 851012
Change-Id: Icb1f296ce4513369ecae424c717f9991baa142c0
Reviewed-on: https://chromium-review.googlesource.com/1100384Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569310}