Remove mac-snowleopard expectation for inline-before-content-after-list-marker-expected

... mac one is correct. Somehow, an incorrect expectation was introduced by auto-rebaseline
at r182279.

TBR=wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/586633002

git-svn-id: svn://svn.chromium.org/blink/trunk@182305 bbb929c8-8fbe-4397-9dbb-9b2b20218538