Rebaseline virtual/windows-directwrite/fast/text/sub-pixel/text-scaling-pixel.html

TBR=dglazkov@chromium.org

Review URL: https://codereview.chromium.org/248183003

git-svn-id: svn://svn.chromium.org/blink/trunk@172390 bbb929c8-8fbe-4397-9dbb-9b2b20218538