Oilpan: mark fast/forms/select/menulist-appearance-basic.html as slow (dbg)

R=haraken@chromium.org
BUG=397425
NOTRY=true

Review URL: https://codereview.chromium.org/419193002

git-svn-id: svn://svn.chromium.org/blink/trunk@178906 bbb929c8-8fbe-4397-9dbb-9b2b20218538