Rebaseline return-from-printing-mode.html

Retina results are now aligned with other platforms.

TBR=timloh@chromium.org

Review URL: https://codereview.chromium.org/356743002

git-svn-id: svn://svn.chromium.org/blink/trunk@176924 bbb929c8-8fbe-4397-9dbb-9b2b20218538