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

Tools/Scripts/webkitpy/layout_tests/port/win_unittest.py

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 import os
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.system import outputcapture
 from webkitpy.common.system.executive_mock import MockExecutive
 from webkitpy.common.system.filesystem_mock import MockFileSystem
 from webkitpy.layout_tests.port import port_testcase
 from webkitpy.layout_tests.port import win
 from webkitpy.tool.mocktool import MockOptions
 
 
 class WinPortTest(port_testcase.PortTestCase):
@@ skipping 80 matching lines @@
 
     def test_operating_system(self):
         self.assertEqual('win', self.make_port().operating_system())
 
     def test_driver_name_option(self):
         self.assertTrue(self.make_port()._path_to_driver().endswith('content_shell.exe'))
         self.assertTrue(self.make_port(options=MockOptions(driver_name='OtherDriver'))._path_to_driver().endswith('OtherDriver.exe'))
 
     def test_path_to_image_diff(self):
         self.assertEqual(self.make_port()._path_to_image_diff(), '/mock-checkout/out/Release/image_diff.exe')