Regenerate spec for "Revert dashes-to-underscores change" change
Regenerate spec for "Revert dashes-to-underscores change" change

https://github.com/tabatkins/bikeshed/commit/1e0a761bfb037a4a8fc28cb45405c966d7d06468

whatwg/mediasession,foolip/mediasession,foolip/mediasession,whatwg/mediasession