Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

> OK, but what happens in a UA that doesn't support that dictionary member?

@bzbarsky Good point. Though in the case of [share()](https://wicg.github.io/web-share/#share-method) at least, an invalid `url` should do it:
```js
var supportsFiles = false;
try {
  navigator.share(Object.defineProperty({url: ' '}, 'capture', {get: function () {
    supportsFiles = true;
  }}));
} catch(e) {}
```

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