Windows rebaselines for ahem tests in virtual DirectWrite suite

New windows results for the virtual DirectWrite test suite now that
the Ahem font is supported for DW.

TBR=dglazkov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/241233002

git-svn-id: svn://svn.chromium.org/blink/trunk@171876 bbb929c8-8fbe-4397-9dbb-9b2b20218538