Disable testPreFetchInstantURLSetsNoCookies

TEST=none
BUG=83459
Review URL: http://codereview.chromium.org/7054028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86188 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/functional/PYAUTO_TESTS

@@ -53,6 +53,8 @@
       'imports',
       'infobars',
       'instant',
+      # crbug.com/83459
+      '-instant.InstantTest.testPreFetchInstantURLSetsNoCookies',
       'navigation',
       'notifications',
       'ntp',