Modifying a download test to wait until download is completed.

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 32 matching lines @@
       'bookmarks',
       'browser',
       'browsing_data',
       'codesign',
       'content',
       '-content.ContentTest.testTopSitesContent',  # crbug.com/71824
       'cookies',
       'crash_reporter',
       'databases',
       'downloads',
-      'find_in_page',      
+      'find_in_page',
       # Turkish I problem. crbug.com/60638
       '-find_in_page.FindMatchTests.testLocalizationAndCaseOrder',
       'execute_javascript',
       'history',
       'https',
       'imports',
       'infobars',
       'instant',
       # crbug.com/83459
       '-instant.InstantTest.testPreFetchInstantURLSetsNoCookies',
@@ skipping 23 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 145 matching lines @@
   # HTML5 media performance tests.
   'MEDIA_TESTS': {
     'linux': [
       'media.media_playbacktime',
       'media.media_perf',
       'media.media_fps',
       'media.media_event_simple_test',
     ],
   },
 }