Pyauto tests were failing on coverage bots because of missing comma.

Review URL: https://chromiumcodereview.appspot.com/10810063

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148015 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/functional/PYAUTO_TESTS

@@ -855,7 +855,7 @@
       '-ntp.NTPTest.testLaunchAppFullScreen',
       '-https.SSLTest.testSSLCertOK',
       '-https.SSLTest.testSSLCertAuthorityOK',
-      '-media.media_basic_playback.MediaConstrainedNetworkPerfTest.testBasicPlaybackMatrix'
+      '-media.media_basic_playback.MediaConstrainedNetworkPerfTest.testBasicPlaybackMatrix',
       '-policy_prefs_ui.PolicyPrefsUITest.testNoUserPoliciesNoBanner',
       '-policy_prefs_ui.PolicyPrefsUITest.testToggleUserPolicyTogglesBanner',
     ],