Rebaseline printing/return-from-printing-mode.html on Mac

BUG=407538
TBR=ccameron@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/497233004

git-svn-id: svn://svn.chromium.org/blink/trunk@180900 bbb929c8-8fbe-4397-9dbb-9b2b20218538