[Webkit-unassigned] [Bug 200427] New: WebRTC: got incorrect `this` in negotiationneeded event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200427

            Bug ID: 200427
           Summary: WebRTC: got incorrect `this` in negotiationneeded
                    event
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zjcqoo at qq.com
                CC: youennf at gmail.com

```html
<!--
UA: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.1 Safari/605.1.15
-->
<script>
const pc = new RTCPeerConnection(null)

pc.onnegotiationneeded = async function(e) {
  console.log(pc === this)  // return false! should be true

  // TypeError:
  // Can only call RTCPeerConnection.createOffer on instances of RTCPeerConnection
  const offer = await this.createOffer()
  console.log('offer:', offer)
}
pc.createDataChannel('x')
</script>
```

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