Removed resampler from NewAudioConferenceMixer and AudioMixer (which started as a copy of former OutputMixer). This is part of the mixer rewrite project. In particular,
this is one of the steps required to have a single mixing component
instead of two doing the same thing.
The next planned change (which is not part of this CL) is to plug in the
new mixer (NewAudioConferenceMixer) into AudioState and AudioDeviceModule.
NOTRY=True
Review-Url: https://codereview.webrtc.org/2221443002
Cr-Commit-Position: refs/heads/master@{#13674}
4496809b28