This is a follow-up to https://codereview.webrtc.org/1965313002/ which
was TBR-landed.
Minor code clean-up/corrections:
Property nativeConfiguration -> - method createNativeConfiguration.
RTCLogWarning -> RTCLogError.
setConfiguration returning NO instead of false.
initWithFactory returning nil instead of nullptr.
Braces around ifs.
Review-Url: https://codereview.webrtc.org/1978233002
Cr-Commit-Position: refs/heads/master@{#12770}
a73ca5668e