Disabling a serch engine pyauto test that's flaky on Mac.

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 112 matching lines @@
       '-downloads.DownloadsTest.testOpenWhenDone',
       '-downloads.DownloadsTest.testAlwaysOpenFileType',
       '-instant.InstantTest.testInstantNavigation',  # crbug.com/69090
       # crbug.com/66072
       '-notifications.NotificationsTest.testNotificationOrderAfterClosingOne',
       '-ntp.NTPTest.testLaunchAppNewWindow',  # crbug.com/79812
       # crbug.com/70437
       '-omnibox.OmniboxTest.testHistoryResult',
       # crbug.com/79263
       '-popups.PopupsTest.testPopupsLaunchUponBrowserBackButton',
+      # crbug.com/69619
+      '-search_engines.SearchEnginesTest.testDiscoverSearchEngine',
       # Keychain popups make sync tests difficult on Mac.  crbug.com/49378
       '-sync',
     ],
 
     'linux': [  # linux != chromeos
       '-browser.BrowserTest.testWindowResize',  # crbug.com/44963
       # System password manager obstructs password automation.
       '-passwords',
       # Gnome / kwallet popups on linux break sync tests.  crbug.com/80329
       '-sync',
@@ skipping 107 matching lines @@
   # HTML5 media performance tests.
   'MEDIA_TESTS': {
     'linux': [
       'media.media_playbacktime',
       'media.media_perf',
       'media.media_fps',
       'media.media_event_simple_test',
     ],
   },
 }