Revert 520483002: Suppress virtual/antialiasedtext/fast/text/zero-font-size-2.html

A Skia change caused this to start failing, and the bug in Skia has since been fixed.
Remove the suppression since these tests have been passing.

TBR=senorblanco,hclam
NOTRY=true
BUG=408858

Review URL: https://codereview.chromium.org/568543002

git-svn-id: svn://svn.chromium.org/blink/trunk@181847 bbb929c8-8fbe-4397-9dbb-9b2b20218538