Mark MessagePort.p.onmessageerror Safari-nosupport (#7391)
Mark MessagePort.p.onmessageerror Safari-nosupport (#7391)

This change marks MessagePort.p.onmessageerror unsupported in Safari and iOS Safari.

Test: https://wpt.live/html/dom/idlharness.https.html

See also https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/dom/MessagePort.idl#L39
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data