Re: [webrtc-pc] RTCIceCandidate constructor should not require sdpMid/sdpMLineIndex

It's back up, and this is what is was:
```JavaScript
[
  'new RTCIceCandidate',
  'new RTCIceCandidate({})',
  'new RTCIceCandidate({ candidate: ""})',
  'new RTCIceCandidate({ candidate: "foo"})',
].forEach(expr => {
  test(() => eval(expr), expr);
});
```

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