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There is a race condition between when Polymer calls observers and when it
updates a two-way bound variable in the parent element.

Bypass the isuse by using the observers parameter instead.

Bug: 896509
Change-Id: I63b13c858b62214d7973af641f67c659de9ea674
Reviewed-on: https://chromium-review.googlesource.com/c/1289410Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600951}