Suppress failures for fast/text/chromium-linux-fontconfig-renderstyle.html

This test will need to be rebaselined after
https://codereview.chromium.org/163433013/ lands.

BUG=342077

Review URL: https://codereview.chromium.org/180523002

git-svn-id: svn://svn.chromium.org/blink/trunk@167889 bbb929c8-8fbe-4397-9dbb-9b2b20218538