browser.js: Avoid misdetecting Chrome OS as OS X #2470
Merged
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Matching for lower-case "os x" not only finds "Mac OS X" but also
"CrOS x86_64". Mismatching Chrome OS as Apple device leads to
playback issues due to differences in supported client formats.
I checked User Agent lists on the Internet (e.g. https://developers.whatismybrowser.com/useragents/explore/) and all Apple browsers seem to report "Mac OS X $version" (mac OS) or something similar to "iPhone OS $version like Mac OS X" (iOS device family), so that extended regex should still work.
Fixes #2477