Remove thirdparty/unittest2 from webkitpy and require python2.7.

Tools/Scripts/webkitpy/layout_tests/models/test_configuration_unittest.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.layout_tests.models.test_configuration import *
 
 
 def make_mock_all_test_configurations_set():
     all_test_configurations = set()
     for version, architecture in (('snowleopard', 'x86'), ('xp', 'x86'), ('win7', 'x86'), ('vista', 'x86'), ('lucid', 'x86'), ('lucid', 'x86_64')):
         for build_type in ('debug', 'release'):
             all_test_configurations.add(TestConfiguration(version, architecture, build_type))
     return all_test_configurations
@@ skipping 320 matching lines @@
             TestConfiguration('xp', 'x86', 'release'),
             TestConfiguration('vista', 'x86', 'release'),
             TestConfiguration('win7', 'x86', 'release'),
         ])
         self.assertEqual(converter.to_specifiers_list(configs_to_match), [set(['win', 'release'])])
 
     def test_specifier_converter_access(self):
         specifier_sorter = TestConfigurationConverter(self._all_test_configurations, MOCK_MACROS).specifier_sorter()
         self.assertEqual(specifier_sorter.category_for_specifier('snowleopard'), 'version')
         self.assertEqual(specifier_sorter.category_for_specifier('mac'), 'version')