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The feature that allowed specifying an element id before the event name
in the listeners object is no longer supported in Polymer 2.

For example:

  listeners: {
    'id.eventName': 'onEventName_',
  }

Bug: 885294
Change-Id: Ieb468d10ebdc3ba436fdc38b8858b6a1b237e93f
Reviewed-on: https://chromium-review.googlesource.com/1237400Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593655}