Enable Woff 2.0 font compression format by default

Feature Dashboard: http://www.chromestatus.com/features/6718644721549312
PSA: https://groups.google.com/a/chromium.org/d/topic/chromium-dev/j27Ou4RtvQI/discussion

BUG=242809,223731

Review URL: https://codereview.chromium.org/199773002

git-svn-id: svn://svn.chromium.org/blink/trunk@169206 bbb929c8-8fbe-4397-9dbb-9b2b20218538