Represent support for webkitRTCPeerConnection (#12196)
Represent support for webkitRTCPeerConnection (#12196)

Tests for the prefixed and unprefixed variants:
http://mdn-bcd-collector.appspot.com/tests/api/RTCPeerConnection/RTCPeerConnection
http://mdn-bcd-collector.appspot.com/tests/api/webkitRTCPeerConnection/webkitRTCPeerConnection

The Chrome data matches https://caniuse.com/rtcpeerconnection and was
confirmed with the above tests.

Support for both were confirmed in Edge 15 on BrowserStack.

The other changes were mirrored.
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data