Polymer/ShadowDOM — pull request #462 by jmesserly (2014-06-26 23:26:26+00:00)
Title: fix form.elements -- this is used by NodeBind getAssociatedRadioButtons

this code in [NodeBind.js](https://github.com/Polymer/NodeBind/blob/master/src/NodeBind.js#L208)

```js
return filter(element.form.elements, function(el) {
return el != element &&
el.tagName == 'INPUT' &&
el.type == 'radio' &&
el.name == element.name;
});
```

...uses form.elements, which was returning unwrapped nodes under SD polyfill. This later causes an error because Node.bind stores bindings_ on the wrapper, and when it doesn't find the data it stored, blows up with a TypeError.

Caught this by running NodeBind tests with platform.js (normally they don't run with SD polyfill -- maybe they should?)