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This is a necessary change now that Polymer 2 is enabled.

Previously, Multidevice and Smart Lock pages were being informed
of an authToken change by their child element passwordPrompt, but that
is no longer bubbling up to the parent. Now, explicitly bind to the
authToken of passwordPrompt as a property, and use it when the dialog
close event is fired. As a consequence of this, the authTokenChanged()
callbacks in both parents is unnecessary and has been removed.

Bug: 934987
Change-Id: Ie0d624dde09f895a7076122aaed9eb224a629a1a
Reviewed-on: https://chromium-review.googlesource.com/c/1484495Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635795}