Removing syntaxerror for ice candidates

Hi,

The current WebRTC API asks to reject ICE candidates that are added when 
they are "malformed" with a SyntaxError.

I'm proposing in https://github.com/w3c/webrtc-pc/pull/242 to remove 
that specific error case, because:

* there is no definition of what it means for an ICE candidate to be 
malformed (the RFC doesn't define such a term)

* no browser seems to be doing this at the moment

* if the ICE candidate can't be applied (including if it's "malformed" 
for some definition of the term), an error will be emitted in any case; 
it's not clear to me that there is particular value in distinguishing 
that case from others

Thoughts?

Dom