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

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

 # Copyright (C) 2010 Google Inc. All rights reserved.
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-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_results
 from webkitpy.layout_tests.models import test_run_results
 
 
 def get_result(test_name, result_type=test_expectations.PASS, run_time=0):
     failures = []
@@ skipping 157 matching lines @@
     def test_timeout_then_unexpected_pass(self):
         tests = ['failures/expected/image.html']
         expectations = test_expectations.TestExpectations(self.port, tests)
         initial_results = test_run_results.TestRunResults(expectations, len(tests))
         initial_results.add(get_result('failures/expected/image.html', test_expectations.TIMEOUT, run_time=1), False, False)
         retry_results = test_run_results.TestRunResults(expectations, len(tests))
         retry_results.add(get_result('failures/expected/image.html', test_expectations.PASS, run_time=0.1), False, False)
         summary = test_run_results.summarize_results(self.port, expectations, initial_results, retry_results, enabled_pixel_tests_in_retry=True, only_include_failing=True)
         self.assertEquals(summary['num_regressions'], 0)
         self.assertEquals(summary['num_passes'], 1)