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There are a couple of Polymer Behaviors currently defined in the
ui/webui/resources/html/* and ui/webui/resources/js/* folders. Since
Polymer Behaviors can only be used in Polymer elements, makes more
sense to define them in cr_elements/ along with other such behaviors.

Moreover this simplifies the testing code by being able to leverage
cr_elements_browsertest.js.

Bug: 1133385
Change-Id: I66eb64812ae4c502452971da003b7a84f5f9d3fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435820Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811835}