Disable the new tab reference tests on mac since the reference build doesn't seem to support all the IPC messages.
Disable the new tab reference tests on mac since the reference build
doesn't seem to support all the IPC messages.

BUG=28028
TBR=chase

Review URL: http://codereview.chromium.org/437072

git-svn-id: http://src.chromium.org/svn/trunk/src@33134 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e4d272b49aedb12c39b911cbfad994c91a547430
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser