[web-audio-api] Make decodeAudioData neuter its array buffer argument when it begins decoding a buffer, and bring it back to normal when the decoding is finished (#188)

> Originally reported on W3C Bugzilla [ISSUE-20161](https://www.w3.org/Bugs/Public/show_bug.cgi?id=20161) Thu, 29 Nov 2012 16:16:26 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

This was discussed in this thread <http://lists.w3.org/Archives/Public/public-audio/2012OctDec/thread.html#msg419> and we reached to the conclusion that the spec needs to change according to the summary of this bug.

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https://github.com/WebAudio/web-audio-api/issues/188