Re: [web-nfc] Attach to navigator (#602)

Alternative [Example 6](https://w3c.github.io/web-nfc/#example-6).

```javascript
navigator.nfc.scan().then(() => {
  console.log("Scan started successfully.");
  navigator.nfc.onerror = event => {
    console.log("Error! Cannot read data from the NFC tag. Try a different one?");
  };
  navigator.nfc.ontagfound = event => {
    let message = await event.ndef.read();
    console.log("NDEF message read.");
  };
}).catch(error => {
  console.log(`Error! Scan failed to start: ${error}.`);
});
```

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Received on Wednesday, 14 October 2020 08:00:17 UTC