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

Tools/Scripts/webkitpy/layout_tests/port/base.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 94 matching lines @@
         ('xp', 'x86'),
         ('win7', 'x86'),
         ('lucid', 'x86'),
         ('lucid', 'x86_64'),
         # FIXME: Technically this should be 'arm', but adding a third architecture type breaks TestConfigurationConverter.
         # If we need this to be 'arm' in the future, then we first have to fix TestConfigurationConverter.
         ('icecreamsandwich', 'x86'),
         )
 
     ALL_BASELINE_VARIANTS = [
-        'mac-yosemite', 'mac-mavericks', 'mac-mountainlion', 'mac-retina', 'mac-lion', 'mac-snowleopard',
+        'mac-yosemite', 'mac-mavericks', 'mac-retina', 'mac-mountainlion', 'mac-lion', 'mac-snowleopard',
         'win-win7', 'win-xp',
         'linux-x86_64', 'linux-x86',
     ]
 
     CONFIGURATION_SPECIFIER_MACROS = {
-        'mac': ['snowleopard', 'lion', 'retina', 'mountainlion', 'mavericks', 'yosemite'],
+        'mac': ['snowleopard', 'lion', 'mountainlion', 'retina', 'mavericks', 'yosemite'],
         'win': ['xp', 'win7'],
         'linux': ['lucid'],
         'android': ['icecreamsandwich'],
     }
 
     DEFAULT_BUILD_DIRECTORIES = ('out',)
 
     # overridden in subclasses.
     FALLBACK_PATHS = {}
 
@@ skipping 1638 matching lines @@
 class PhysicalTestSuite(object):
     def __init__(self, base, args, reference_args=None):
         self.name = base
         self.base = base
         self.args = args
         self.reference_args = args if reference_args is None else reference_args
         self.tests = set()
 
     def __repr__(self):
         return "PhysicalTestSuite('%s', '%s', %s, %s)" % (self.name, self.base, self.args, self.reference_args)