Suppressing memory leak in Mac unit test.
Suppressing memory leak in Mac unit test.

TBR=thakis@chromium.org
BUG=64797
TEST=mac valgrind unit test should cycle green

Review URL: http://codereview.chromium.org/5390003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@67747 0039d316-1c4b-4281-b951-d872f2087c98

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