Removing the flag for toggling sub-pixel layout since we'll no longer support running without this enabled. R=eae TEST=yes BUG=

Review URL: https://codereview.chromium.org/13647007

git-svn-id: svn://svn.chromium.org/blink/trunk@147528 bbb929c8-8fbe-4397-9dbb-9b2b20218538