Google Chrome	57.0.2970.0 (Official Build) dev (64-bit)
OS: ChromeOS

What steps will reproduce the problem?
(1) Mute audio
(2) Start music playback
(3) Press Mute button

What is the expected result?
Music stays muted.

What happens instead?
Music is unmuted for one second before being muted again every time I press mute button.