Rebase fast/css/css2-system-fonts.html test expectations on Win XP

Attempt 2.

Notry because we don't have an XP trybot.
NOTRY=TRUE
BUG=354849

Review URL: https://codereview.chromium.org/196173017

git-svn-id: svn://svn.chromium.org/blink/trunk@169892 bbb929c8-8fbe-4397-9dbb-9b2b20218538