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

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

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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.tool.mocktool import MockOptions
 from webkitpy.common.system.systemhost_mock import MockSystemHost
 
 from webkitpy.layout_tests.port import android
 from webkitpy.layout_tests.port import linux
 from webkitpy.layout_tests.port import mac
 from webkitpy.layout_tests.port import win
 from webkitpy.layout_tests.port import factory
 from webkitpy.layout_tests.port import test
@@ skipping 37 matching lines @@
 
     def test_unknown_specified(self):
         self.assertRaises(NotImplementedError, factory.PortFactory(MockSystemHost()).get, port_name='unknown')
 
     def test_unknown_default(self):
         self.assertRaises(NotImplementedError, factory.PortFactory(MockSystemHost(os_name='vms')).get)
 
     def test_get_from_builder_name(self):
         self.assertEqual(factory.PortFactory(MockSystemHost()).get_from_builder_name('WebKit Mac10.7').name(),
                           'mac-lion')