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

Tools/Scripts/webkitpy/layout_tests/views/buildbot_results_unittest.py

-#!/usr/bin/env python
 # Copyright (C) 2012 Google Inc. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
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 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
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 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 import StringIO
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.host_mock import MockHost
 
 from webkitpy.layout_tests.models import test_expectations
 from webkitpy.layout_tests.models import test_failures
 from webkitpy.layout_tests.models import test_run_results
 from webkitpy.layout_tests.models import test_run_results
 from webkitpy.layout_tests.models import test_run_results_unittest
 from webkitpy.layout_tests.views import buildbot_results
 
@@ skipping 51 matching lines @@
 
     def test_print_results(self):
         port = MockHost().port_factory.get('test')
         printer, out = self.get_printer()
         initial_results = test_run_results_unittest.run_results(port)
         full_summary = test_run_results_unittest.summarized_results(port, expected=False, passing=True, flaky=False)
         failing_summary = test_run_results_unittest.summarized_results(port, expected=False, passing=True, flaky=False, only_include_failing=True)
         details = test_run_results.RunDetails(failing_summary['num_regressions'], full_summary, failing_summary, initial_results, None)
         printer.print_results(details)
         self.assertTrue(out.getvalue().find('but passed') != -1)