Mac color: Apply Sierra workaround unconditionally

This was accidentally enabled on just <10.12. It didn't cause any
issues, so expand to 10.12.

BUG=633805

Review-Url: https://codereview.chromium.org/2405883002
Cr-Commit-Position: refs/heads/master@{#424190}
(cherry picked from commit 139c0a4a023d168763f0983bebe2790b38419bb2)

Review URL: https://codereview.chromium.org/2405363003 .

Cr-Commit-Position: refs/branch-heads/2840@{#731}
Cr-Branched-From: 1ae106dbab4bddd85132d5b75c670794311f4c57-refs/heads/master@{#414607}
1 file changed