Sergey Biryukov d8da981665 Build/Test Tools: Update prefixed CSS properties in about.css.
Firefox 52+ supports unprefixed `column-count` and `column-gap` properties.

Props netweb, afercia.
Merges [42687] to the 4.9 branch.
Fixes #43190.
Built from https://develop.svn.wordpress.org/branches/4.9@42802


git-svn-id: http://core.svn.wordpress.org/branches/4.9@42632 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-03-08 19:41:44 +00:00
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