[webrtc-pc] new commits pushed by aboba

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

* Fixed spelling of scaleResolutionDownBy in example.
  by stefhak
https://github.com/w3c/webrtc-pc/commit/adee435dab22dd836da2c2f48c57108236531848

* Merge pull request #1578 from stefhak/scalereso

Fixed spelling of scaleResolutionDownBy in example.
  by Bernard Aboba
https://github.com/w3c/webrtc-pc/commit/460fdae818dd1a86517f7225557b67de1876f4f0