Revert of Unskip virtual/antialiasedtext/fast/text/sub-pixel/text-scaling-pixel.html (https://codereview.chromium.org/380023003/)

Reason for revert:
Caused layout test failure:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=virtual%2Fantialiasedtext%2Ffast%2Ftext%2Fsub-pixel%2Ftext-scaling-pixel.html


Original issue's description:
> Unskip virtual/antialiasedtext/fast/text/sub-pixel/text-scaling-pixel.html
> 
> Unskip the virtual/antialiasedtext/fast/text/sub-pixel/text-scaling-
> pixel.html test but mark it as flaky to see if it still fails and if
> so why.
> 
> TBR=dominik.rottsches@intel.com
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177779

TBR=dominik.rottsches@intel.com,eae@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/380973002

git-svn-id: svn://svn.chromium.org/blink/trunk@177795 bbb929c8-8fbe-4397-9dbb-9b2b20218538