Disable FullscreenMouselockTest.testPrefsForFullscreenExit.

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2012 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 191 matching lines @@
       # Autofill on Mac. crbug.com/95165
       '-browsing_data.BrowsingDataTest.testClearAutofillData',
       # codesign tests should run *after* signing. crbug.com/50481
       '-codesign',
       # crbug.com/69464
       '-crash_reporter.CrashReporterTest.testRendererCrash',
       # crbug.com/75724
       '-downloads.DownloadsTest.testDeclineDangerousDownload',
       # crbug.com/75724
       '-downloads.DownloadsTest.testSaveDangerousFile',
+      # Fails on chrome-mac-10_7-qa only: crbug.com/124886
+      '-fullscreen_mouselock.FullscreenMouselockTest.testPrefsForFullscreenExit',
       # crbug.com/119110
       '-https.SSLTest.testSSLCertAuthorityOK',
       # crbug.com/114244
       '-imports.ImportsTest.testImportSafariDataTwice',
       # crbug.com/121484
       '-multiprofile.MultiprofileTest.test20NewProfiles',
       '-ntp.NTPTest.testLaunchAppNewWindow',  # crbug.com/79812
       # Causes browser crash.  crbug.com/93548
       '-notifications.NotificationsTest.testIncognitoNotification',
       '-notifications.NotificationsTest.testOriginPrefsNotSavedInIncognito',
@@ skipping 515 matching lines @@
 
   # HTML5 media performance tests.
   'AV_PERF': {
      'linux': [
        'media.media_constrained_network_perf',
        'media.media_jerky',
        'media.media_stat_perf',
      ],
   },
 }