Import fonts/ from web-plaform-tests, but not fonts/math/

The copy in media/ is identical, and has been removed upstream:
https://github.com/w3c/web-platform-tests/pull/5678

[email protected],[email protected]

Review-Url: https://codereview.chromium.org/2838673002
Cr-Commit-Position: refs/heads/master@{#466961}
1 file changed