[Mac] get the reliability_tests binary archived in chromium builds.
[Mac] get the reliability_tests binary archived in chromium builds.

BUG=31511
TEST=reliability_tests shows up in the snapshots dir on mac (will be copied in archive_build of Chromium Mac)
Review URL: http://codereview.chromium.org/525006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@35457 0039d316-1c4b-4281-b951-d872f2087c98

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