[web-audio-api] Clarify PannerNode.listener (#184)

> Originally reported on W3C Bugzilla [ISSUE-19873](https://www.w3.org/Bugs/Public/show_bug.cgi?id=19873) Tue, 06 Nov 2012 01:58:38 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

The Web IDL definition of PannerNode does not include a listener attribute, but the description of the attributes seem to imply that one should exist.

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Reply to this email directly or view it on GitHub:
https://github.com/WebAudio/web-audio-api/issues/184