[web-nfc] Fix spec issue after things from promise guide moved into web idl (#342)

kenchris has just created a new issue for https://github.com/w3c/web-nfc:

== Fix spec issue after things from promise guide moved into web idl ==
![image](https://user-images.githubusercontent.com/1101339/64259914-48e42c80-cf2a-11e9-97db-212d76650728.png)

Either we need to use

![image](https://user-images.githubusercontent.com/1101339/64259955-5bf6fc80-cf2a-11e9-8d7f-2bd9b2b09f70.png)

or

![image](https://user-images.githubusercontent.com/1101339/64259992-69ac8200-cf2a-11e9-86e6-df384c5b0234.png)


Please view or discuss this issue at https://github.com/w3c/web-nfc/issues/342 using your GitHub account

Received on Wednesday, 4 September 2019 13:41:15 UTC