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This was an "alias" for -webkit-column-span:none. '1' is not a valid value,
according to the spec. The only valid values are 'none' and 'all'. In an older
version of the spec, '1' and 'all' were the valid values. In the latest version
(2011), '1' was changed to 'none'.

It's highly unlikely that removing this should cause compatibility problems.
The initial value is 'none' (which is what '1' was mapped to), so in order to
cause trouble, one would need a declaration -webkit-column-span:all to be
overridden by a -webkit-column-span:1. I went through httparchive to verify.
No sites were found to do this.

R=timloh@chromium.org

Review URL: https://codereview.chromium.org/1635993002

Cr-Commit-Position: refs/heads/master@{#371773}