Disabled few flaky tests on Mac

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 190 matching lines @@
       # crbug.com/69619
       '-search_engines.SearchEnginesTest.testDiscoverSearchEngine',
       # Keychain popups make sync tests difficult on Mac.  crbug.com/49378
       '-sync',
       # crbug.com/87837
       '-plugins.PluginsTest.testBlockPluginException',
       '-plugins.PluginsTest.testDisableEnableAllPlugins',
       '-plugins.PluginsTest.testKillAndReloadAllPlugins',
       # Causes unexpected browser crash in Debug. crbug.com/75518
       '-shortcuts.ShortcutsTest.testClearBrowsingDataShortcut',
+      #crbug.com/91617

[Nirnimesh, 2011/08/04 00:33:40]

put a space after #

+      '-omnibox.OmniboxTest.testOmniboxSearchHistory',

[Nirnimesh, 2011/08/04 00:33:40]

Arrange in alphabetical order. ie put this one after line 196 above

+      '-omnibox.OmniboxTest.testContentHistory',
     ],
 
     'linux': [  # linux != chromeos
       # ===========================
       # Permanently-disabled tests.
       # ===========================
       '-browser.BrowserTest.testWindowResize',  # Details at: crbug.com/44963
       # Several omnibox tests do not show omnibox results when run
       # under virtual X on linux.  The CONTINUOUS suite runs under virtual X
       # on the chromium bots, so exlcude these from here.  They're included
@@ skipping 254 matching lines @@
 
   # HTML5 media functional tests.
   'AV_FUNC': {
      'linux': [
        'media.media_event_simple_action',
        'media.media_event_simple_test',
        'media.media_event_track',
      ],
   },
 }