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

Tools/Scripts/webkitpy/common/net/layouttestresults_unittest.py

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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.net.layouttestresults import LayoutTestResults
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.layout_tests.models import test_results
 from webkitpy.layout_tests.models import test_failures
 from webkitpy.thirdparty.BeautifulSoup import BeautifulSoup
 
 
 class LayoutTestResultsTest(unittest.TestCase):
     # The real files have no whitespace, but newlines make this much more readable.
@@ skipping 59 matching lines @@
         self.assertFalse(LayoutTestResults.results_from_string('ADD_RESULTS({"tests":{},"interrupted":false});').run_was_interrupted())
 
     def test_blink_revision(self):
         self.assertEqual(LayoutTestResults.results_from_string(self.example_full_results_json).blink_revision(), 1234)
 
     def test_actual_results(self):
         results = LayoutTestResults.results_from_string(self.example_full_results_json)
         self.assertEqual(results.actual_results("fast/dom/prototype-banana.html"), "PASS")
         self.assertEqual(results.actual_results("fast/dom/prototype-taco.html"), "PASS TEXT")
         self.assertEqual(results.actual_results("nonexistant.html"), "")