Add a suppression for bug70599.
Add a suppression for bug70599.

It happens with nearly 100% probability in NaCl browser_tests. Not on the bots yet.

Review URL: http://codereview.chromium.org/7184006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@89314 0039d316-1c4b-4281-b951-d872f2087c98

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