Enable popups.PopupsTest.testPopupsLaunchUponBrowserBackButton on Mac.

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 200 matching lines @@
       '-notifications.NotificationsTest.testOriginPrefsNotSavedInIncognito',
       '-notifications.NotificationsTest.testNotificationOrderAfterClosingOne',
       # crbug.com/70437
       '-omnibox.OmniboxTest.testHistoryResult',
       # crbug.com/91617
       '-omnibox.OmniboxTest.testContentHistory',
       # Keychain popups make autofill/password tests difficult: crbug.com/49378
       '-passwords',
       # crbug.com/97140
       '-plugins.PluginsTest.testDisableEnableAllPlugins',
-      # 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',
       # crbug.com/98526
       '-pyauto_webdriver.PyAutoWebDriverTest.testCanConnectToRestartedBrowser',
       '-pyauto_webdriver.PyAutoWebDriverTest.testTypeIntoTextBox',
       # crbug.com/109035
       '-youtube.YoutubeTest.testPlayerBytes',
       # crbug.com/109035
@@ skipping 503 matching lines @@
 
   # WebRTC MediaStream tests. Requires webcam and audio device to be present on
   # the test machine.
   'WEBRTC': {
     'all': [
       'media_stream_infobar',
       'webrtc_call',
     ],
   },
 }