fe0fd41bb9
Also did some slight refactoring of the code that turns constraints into rtc::Optionals. Used a template method to avoid code duplication, and used the same pattern for "CopyConstraintsIntoAudioOptions" as was being used for "CopyConstraintsIntoRtcConfiguration". BUG=webrtc:6752 Review-Url: https://codereview.webrtc.org/2628523003 Cr-Commit-Position: refs/heads/master@{#16063}