[webrtc-pc] new commits pushed by alvestrand

The following commits were just pushed by alvestrand to https://github.com/w3c/webrtc-pc:

* Fire closing event

This fires the closing event only when close was not initiated locally.

Fixes #2433
  by Harald Alvestrand
https://github.com/w3c/webrtc-pc/commit/0be0a39c101274bf328674a43c67cd02b39ce946

* Add period and format
  by Harald Alvestrand
https://github.com/w3c/webrtc-pc/commit/f00a26fd450d4833a868123fd6c3c9db8d301b64

* Merge pull request #2434 from w3c/fire-closing-event

Fire closing event
  by Harald Alvestrand
https://github.com/w3c/webrtc-pc/commit/bb208f7223f9e2f951f304c0c3ac77b28a64130f