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The python unittest failed to run setUpClass/tearDownClass because of python version is 2.6 in pyauto bots. This CL makes a workaround to fix this issue.

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/11830030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175879 0039d316-1c4b-4281-b951-d872f2087c98