Rebaseline virtual/fasttextautosizing/fast/text-autosizing/hackernews-comments.html for XP

The auto-rebaseline bot missed XP in Blink r164979, so
rebaseline manually.

BUG=none
R=pdr@chromium.org
TBR=pdr@chromium.org

Review URL: https://codereview.chromium.org/137273004

git-svn-id: svn://svn.chromium.org/blink/trunk@165011 bbb929c8-8fbe-4397-9dbb-9b2b20218538