Disable all PyAuto instant tests on ChromeOS.

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 308 matching lines @@
       '-autofill.AutofillTest.testPostalCodeAndStateLabelsBasedOnCountry',
       # Downloads panel stays even after declining a download.
       # crosbug.com/14728
       '-downloads.DownloadsTest.testDeclineDangerousDownload',
       # Need internal data dirs in autotest package. crosbug.com/6855
       '-find_in_page.FindMatchTests.testSearchInPDF',
       # Plugin crash infobar does not show up for file:/// flash urls
       # crosbug.com/14971
       '-infobars.InfobarTest.testPluginCrashInfobar',
       # Flaky: crosbug.com/14439
-      '-instant.InstantSettingsTest.testEnableDisableInstant',
+      '-instant',
       # crosbug.com/14256
       '-ntp.NTPTest.testLaunchAppFullScreen',
       # Content history broken in omnibox.  crosbug.com/14416
       '-omnibox.OmniboxTest.testContentHistory',
       # crosbug.com/19760
       '-passwords.PasswordTest.testClearFetchedCredForNewUserName',
       '-passwords.PasswordTest.testSavedPasswordInTabsAndWindows',
       # onunload popups get created in the same window on chromeos
       # crosbug.com/14924
       '-popups.PopupsTest.testPopupsLaunchWhenTabIsClosed',
@@ skipping 289 matching lines @@
 
   # HTML5 media functional tests.
   'AV_FUNC': {
      'linux': [
        'media.media_event_simple_action',
        'media.media_event_simple_test',
        'media.media_event_track',
      ],
   },
 }