Disabling downloads pyauto test on Windows that's flaky

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 73 matching lines @@
       'test_basic',
       'themes',
     ],
 
     'win': [
       # Some download test fails on win official builder, only thru buildbot
       # when downloading the small zip file.
       # crbug.com/50481, crbug.com/54942
       '-downloads.DownloadsTest.testZip',
       '-downloads.DownloadsTest.testRemoveDownload',
+      '-downloads.DownloadsTest.testDownloadsPersistence',  # crbug.com/83942
       # crbug.com/66072
       '-notifications.NotificationsTest.testNotificationOrderAfterClosingOne',
       # crbug.com/70694, crbug.com/73078
       '-passwords.PasswordTest.testInfoBarDisappearByReload',
       '-passwords.PasswordTest.testNeverSavePasswords',
       # crbug.com/67588
       '-passwords.PasswordTest.testSavedPasswordInTabsAndWindows',
       '-prefs.PrefsTest.testDownloadDirPref',
       # crbug.com/83820
       '-passwords.PasswordTest.testInfoBarDisappearByNavigatingPage',
@@ skipping 143 matching lines @@
   # HTML5 media performance tests.
   'MEDIA_TESTS': {
     'linux': [
       'media.media_playbacktime',
       'media.media_perf',
       'media.media_fps',
       'media.media_event_simple_test',
     ],
   },
 }