Gardening: Mark textStyles.svg as failing on Win7 (dbg)

TBR=arv@chromium.org
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/549413002

git-svn-id: svn://svn.chromium.org/blink/trunk@181601 bbb929c8-8fbe-4397-9dbb-9b2b20218538