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

Tools/Scripts/webkitpy/layout_tests/layout_tests_mover_unittest.py

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 import logging
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.checkout.scm.scm_mock import MockSCM
 from webkitpy.common.system.filesystem_mock import MockFileSystem
 from webkitpy.layout_tests.layout_tests_mover import LayoutTestsMover
 from webkitpy.layout_tests.port import base
 
 
 class MockPort(base.Port):
 
@@ skipping 127 matching lines @@
 
     def test_directory_expectation_is_updated(self):
         self._mover.move('origin/path', 'destination')
         self.assertFalse('origin/path' in self._filesystem.read_text_file(self._port._absolute_path('TestExpectations')))
         self.assertTrue('crbug.com/42 [ Win ] destination [ Slow ]' in self._filesystem.read_text_file(self._port._absolute_path('TestExpectations')))
 
     def test_expectation_is_added_when_subdirectory_moved(self):
         self._mover.move('origin/path', 'destination')
         self.assertTrue('crbug.com/42 [ Release ] origin [ Crash ]' in self._filesystem.read_text_file(self._port._absolute_path('TestExpectations')))
         self.assertTrue('crbug.com/42 [ Release ] destination [ Crash ]' in self._filesystem.read_text_file(self._port._absolute_path('TestExpectations')))