Update Ahem.woff2

The wire format of woff2 has changed as of ots r112.
I used woff2_compress to generate this font.

BUG=368983

Review URL: https://codereview.chromium.org/268593003

git-svn-id: svn://svn.chromium.org/blink/trunk@173065 bbb929c8-8fbe-4397-9dbb-9b2b20218538