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Before this CL, the <multidevice-setup> element was told what "UI mode"
(i.e., OOBE vs. post-OOBE) and behaved differently depending on what
mode was active. This abstraction was leaky, since it caused the element
to change its logic based on what its client at a higher level was.

This CL adds a MultiDeviceSetupDelegate interface and injects this
interface into the <multidevice-setup> element, which uses it to perform
tasks such as setting the host device. One concrete implementation of
this interface is provided for the post-OOBE case; a future CL will add
an implementation for OOBE.

This CL also removes multidevice_setup_dialog.js in favor of adding a
new <multidevice-setup-post-oobe> element.

Bug: 884058
Change-Id: I76b6553928e706da4870339d306bc32bea7ac3e6
Reviewed-on: https://chromium-review.googlesource.com/1247525Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595258}