Rebaseline svg/text/font-size-below-point-five-2.svg for XP

Remaining rebaseline from r158845.

TBR=leviw@chromium.org
BUG=

Review URL: https://codereview.chromium.org/26505003

git-svn-id: svn://svn.chromium.org/blink/trunk@159124 bbb929c8-8fbe-4397-9dbb-9b2b20218538