Add *_test_util.* to whitelist for test-only presubmit check.

BUG=none


Review URL: http://codereview.chromium.org/9460063

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@123871 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed