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Yes, it does.

http://dxr.mozilla.org/mozilla-central/source/media/webrtc/

They cooperate on the same stack (webrtc.org) which deals with audio/video processing. Networking, JavaScript bindings, etc (the part exposed to the outside world where standardization matters) are separate. This ironically means that interoperability isn't a given, took a while to achieve, and was worthy of a press release.

The relevant code was originally from GIPS: http://www.gipscorp.com/ which Google bought.

Note the Google implementation is full of code from Cisco. FWIW.

That would be news to me. They aren't listed in the AUTHORS file:

https://code.google.com/p/webrtc/source/browse/trunk/AUTHORS

Don't confuse a WebRTC implementation with the Cisco supplied H.264 codec binary and MPEG LA coverage. You get H.264 support in Mozilla & Chrome via this mechanism.

Thought of the same thing. Anyone know?

There are a few different layers to the WebRTC stack. I believe they use the lower layer which does the video and audio processing. But they don't use the higher layers from which do ICE, SCTP, and SDP.