Revert "Merge pull request #1384 from dlondero/issue-1384"

This reverts commit ab9134baf6a8eb0592c265c00593e6705ee3b8cc, reversing
changes made to 6ea2340c309a42af44901182996f1e542bc6e785.
Merge pull request #1386 from dlondero/issue-1386

Revert fontFace mixin