static get config() is not called any more

[tirithen]

Description

When I removed and refetched my bower dependencies for #2.0-preview I noticed that the static config method is not called any more which makes it impossible to define properties. Maybe something was added recently that broke this part. There is a live demo below, when I run locally with updated dependencies the property that I declared and assigned is undefined. Yesterday everything was working fine. The JSBin I provide does not run, but that seem more because of the service than the code I put in there.

Live Demo

https://jsbin.com/fuwuliveho/edit?html,console,output

It won't run the script, but there is at least the code

Steps to Reproduce

1. Copy code from JSBin
2. Save to file locally
3. Fix the two dependencies
4. Load the page in a browser with the console open

Expected Results

The property a-value/aValue should have the value "hello world".

Actual Results

The property a-value/aValue is undefined and the static get config method does not seem to be called any more.

Browsers Affected

• Chrome
• Firefox
• Edge
• Safari 9
• Safari 8
• IE 11

Versions

• Polymer: 2.0-preview
• webcomponents: v1

[tony19]

See #4332. The config getter was split out into individual getters for properties and observers.