Gardening: Mac 10.6 expectations

Rebasing these off the bot wasn't working. Needs manual love?

TBR=eustas@chromium.org
BUG=334269

Review URL: https://codereview.chromium.org/618403002

git-svn-id: svn://svn.chromium.org/blink/trunk@183097 bbb929c8-8fbe-4397-9dbb-9b2b20218538