Not working properly with shadow DOM

[florianlh]

The paper-input-autocomplete-chips element only works when local DOM is rendered using Polymer 1.x's default "shady DOM" mode. Using is in a page using Polymer with shadow DOM causes several small bugs.

Here is a couple of issues I've seen with shadow DOM enabled:

• keyboard control in the suggestions list does not work
• "selected" style on hovering in suggestions list is not removed on mouseout

Steps to reproduce: load demo page with shadow DOM enabled: https://user-content-dot-custom-elements.appspot.com/WebPaperElements/paper-input-autocomplete-chips/0.30.4/paper-input-autocomplete-chips/demo/index.html?dom=shadow