Tools/TestWebKitAPI/Tests/WebKitCocoa/disableGetUserMedia.html

<script>
    function gotUserMedia(mediaStream)
    {
        window.webkit.messageHandlers.testHandler.postMessage('allowed');
    }

    function userMediaError(error)
    {
        window.webkit.messageHandlers.testHandler.postMessage('denied');
    }

    var constraints = { audio: false, video: true};
    navigator.mediaDevices.getUserMedia(constraints)
        .then(gotUserMedia).
        catch(userMediaError);
</script>