[web-audio-api] The parameter to AudioContext.createDelay should be float, not double (#178)

> Originally reported on W3C Bugzilla [ISSUE-19807](https://www.w3.org/Bugs/Public/show_bug.cgi?id=19807) Thu, 01 Nov 2012 00:01:32 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

The AudioParam min and max values are expressed in floats, not doubles.  createDelay should be changed accordingly, I think.

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https://github.com/WebAudio/web-audio-api/issues/178