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The settings-multidevice-setup-page listens for the event 'close'
as a proxy for the password prompt being confirmed. However, the
event type 'close' is ubiquitous to cr-dialog so it also fires when
the forget device dialog is closed on the subpage, which causes the
assertion "assert(this.featureToBeEnabledOnceAuthenticated_ !== null)"
in SettingsMultidevicePageElement.onPasswordPromptDialogClose() to
fail.

This CL only calls onPasswordPromptDialogClose_ if the close event came
from the MultiDevice page's password prompt and stops the event's
propagation.

Bug: 887160
Change-Id: I5740061c8f9e08ee5ba9e8d99862bcec6b0a6677
Reviewed-on: https://chromium-review.googlesource.com/1235321
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592908}