Polymer/ShadowDOM — pull request #448 by arv (2014-05-30 16:01:25+00:00)
Title: Fix issue with DOMTokenList

The build.json file did not include DOMTokenList leading to
classList being brokon in 0.3.0

This adds a test that ensures that the list of files is in sync so
that these kind of errors do not happen again.

Fixes #445