Chrome Version: 58.0.3029.51 (Official Build) beta （32 bit)
OS: CrOS 9334.33.0 Kevin.

What steps will reproduce the problem?
(1) Choose Cast from menu 
(2) Choose a video conference to join and cast a tab.

What is the expected result?
Tab is cast.

What happens instead?
Tab is cast, mic audio is captured to remote end and remote audio is played back locally.
Causing echo, feedback, noise, whatever.


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