Re: [web-nfc] Add method for clearing all watches?

cancelAllWatches() should suffice for now, until we get 
```CancellablePromise```s, and still make sense when we do. Similar to
 #86

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GitHub Notif of comment by kenchris
See https://github.com/w3c/web-nfc/issues/85#issuecomment-153323503

Received on Tuesday, 3 November 2015 11:23:37 UTC