Fix Issue 2176 - Incorrect param signature on AudioContext.createMediaElementSource()
Fix Issue 2176 - Incorrect param signature on AudioContext.createMediaElementSource()

Summary:
Flow types the parameter to AudioContext.createMediaElementSource() as a stream?: MediaStream, when according to the spec, it should be typed as myMediaElement: HTMLMediaElement. Submitting a pull request today.

flow:
https://github.com/facebook/flow/blob/0deefc1f4e01d0b20f2a168a6facfb09bc39c4c6/lib/bom.js#L388

spec:
https://webaudio.github.io/web-audio-api/#widl-AudioContext-createMediaElementSource-MediaElementAudioSourceNode-HTMLMediaElement-mediaElement
Closes https://github.com/facebook/flow/pull/2179

Differential Revision: D3656822

Pulled By: gabelevi

fbshipit-source-id: 993dfd92b448306e8a81d555fa6fb0ddbb83e7ae

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