Inconsistency between Chrome and Firefox in P2P call

[atsakiridis]

Scenario:

• Bob makes an audio/video call to Alice
• Alice answers with audio only

In Chrome (49.0.2623.110):

• Alice doesn't send video to Bob as she should but, she doesn't get video from Bob either, even though Bob initiated an audio/video call (in SDP answer Alice negates the m-video line by using port 0)

In Firefox (45.0.1):

• Alice doesn't send video to Bob as she should and also get video from Bob (in SDP answer Alice just uses recv-only and doesn't negate the whole stream)

Firefox seems the right thing to do for P2P calls, so we should investigate Chrome

[atsakiridis]

Let's see if in case this doesn't happen anymore