Changes

'''We've replaced the AEC we were using with the new Delay-Agnostic AEC. It is currently enabled by a pref. If we hear of regressions, we may pref off before Fx45 goes to Release. If you hear echo, please let [mailto:mreavy@mozilla.com Maire] (mreavy on irc) know as soon as you can. (See {{Bug|1226347}}.)'''

* Updated webrtc.org code to branch 43 . (See {{Bug|1198458}}).* Making onnegotiationneeded asynchronous can break pages that don't expect this. (See {{Bug|1175609}}.)* {{Bug|1222405}} introduced a regression. We will uplifting a fix for this regression before Fx45 goes to Beta. Follow {{Bug|1240054}} for status.* [Web Audio] Input gain to a StereoPannerNode is no longer ignored when pan is 0. (See {{Bug|1214239}})* [Web Audio] PeriodicWave now supports a minimum of 8192 elements. (See {{Bug|1171436}}.)* Additional Web Audio Perf improvements.