Enable new tab test reference builds on Mac now that the reference builds are new enough.
Enable new tab test reference builds on Mac now that the reference builds are new enough.

BUG=28028

Review URL: http://codereview.chromium.org/463034

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@33865 0039d316-1c4b-4281-b951-d872f2087c98

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