Re: [web-midi-api] requestMIDIAccess will raise "InvalidSecurityError" (#78)

If `requestMIDIAccess()` is used with a promise, then the promises' error resolver(?) should be invoked with the error instead (i.e., an exception should not be thrown).  

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https://github.com/WebAudio/web-midi-api/pull/78#issuecomment-23360335