Re: [webrtc-pc] Only fire negotiationneeded when chain is/becomes empty. (#2509)

This PR is based on implementation being tested and ready to land in Firefox in [bug 1628139](https://bugzil.la/1628139) with WPT tests.

This is blocking and is needed to green up the [perfect negotiation WPT tests](https://bugzil.la/1621399).

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Received on Thursday, 9 April 2020 21:40:14 UTC