Gardening: mark printing/return-from-printing-mode.html on MountainLion as ImageOnlyFailure

BUG=361729
TBR=enne
NOTRY=true

Review URL: https://codereview.chromium.org/286623003

git-svn-id: svn://svn.chromium.org/blink/trunk@173936 bbb929c8-8fbe-4397-9dbb-9b2b20218538