Fix position of Mac retina in lists ordered according to fallback chain.

Tools/Scripts/webkitpy/layout_tests/port/mac.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 20 matching lines @@
 import logging
 import signal
 
 from webkitpy.layout_tests.port import base
 
 
 _log = logging.getLogger(__name__)
 
 
 class MacPort(base.Port):
-    SUPPORTED_VERSIONS = ('snowleopard', 'lion', 'retina', 'mountainlion', 'mavericks', 'yosemite')
+    SUPPORTED_VERSIONS = ('snowleopard', 'lion', 'mountainlion', 'retina', 'mavericks', 'yosemite')
     port_name = 'mac'
 
     # FIXME: We treat Retina (High-DPI) devices as if they are running
     # a different operating system version. This is lame and should be fixed.
     # Note that the retina versions fallback to the non-retina versions and so no
     # baselines are shared between retina versions; this keeps the fallback graph as a tree
     # and maximizes the number of baselines we can share that way.
     # We also currently only support Retina on 10.9.
 
     FALLBACK_PATHS = {}
@@ skipping 59 matching lines @@
     def _path_to_driver(self, configuration=None):
         # FIXME: make |configuration| happy with case-sensitive file systems.
         return self._build_path_with_configuration(configuration, self.driver_name() + '.app', 'Contents', 'MacOS', self.driver_name())
 
     def _path_to_helper(self):
         binary_name = 'layout_test_helper'
         return self._build_path(binary_name)
 
     def _path_to_wdiff(self):
         return 'wdiff'