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

Tools/Scripts/webkitpy/layout_tests/layout_package/bot_test_expectations_unittest.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 #     * Redistributions of source code must retain the above copyright
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 # this software without specific prior written permission.
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 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.layout_tests.layout_package import bot_test_expectations
 from webkitpy.layout_tests.models import test_expectations
 from webkitpy.layout_tests.port import builders
 
 
 class BotTestExpectationsFactoryTest(unittest.TestCase):
     def fake_results_json_for_builder(self, builder):
         return bot_test_expectations.ResultsJSON(builder, 'Dummy content')
 
@@ skipping 149 matching lines @@
         self._assert_unexpected_results(test_data, {
             'foo/pass1.html': sorted(["FAIL", "PASS"]),
             'foo/pass2.html': sorted(["IMAGE", "PASS"]),
             'foo/fail.html': sorted(["TEXT", "PASS"]),
             'foo/f_p.html': sorted(["TEXT", "PASS"]),
             'foo/crash.html': sorted(["WONTFIX", "CRASH", "TEXT"]),
             'foo/image.html': sorted(["CRASH", "FAIL", "IMAGE"]),
             'foo/i_f.html': sorted(["PASS", "IMAGE", "TEXT"]),
             'foo/all.html': sorted(["TEXT", "PASS", "IMAGE+TEXT", "TIMEOUT", "CRASH", "IMAGE", "MISSING", "LEAK"]),
         })