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

Tools/Scripts/webkitpy/layout_tests/servers/server_base_unittest.py

 # Copyright (C) 2012 Google Inc. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
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 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
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 # this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.host_mock import MockHost
 from webkitpy.layout_tests.port import test
 from webkitpy.layout_tests.servers.server_base import ServerBase
 
 
 class TestServerBase(unittest.TestCase):
     def test_corrupt_pid_file(self):
         # This tests that if the pid file is corrupt or invalid,
         # both start() and stop() deal with it correctly and delete the file.
         host = MockHost()
         test_port = test.TestPort(host)
 
         server = ServerBase(test_port, test_port.default_results_directory())
         server._pid_file = '/tmp/pidfile'
         server._spawn_process = lambda: 4
         server._is_server_running_on_all_ports = lambda: True
 
         host.filesystem.write_text_file(server._pid_file, 'foo')
         server.stop()
         self.assertEqual(host.filesystem.files[server._pid_file], None)
 
         host.filesystem.write_text_file(server._pid_file, 'foo')
         server.start()
         self.assertEqual(server._pid, 4)
 
         # Note that the pid file would not be None if _spawn_process()
         # was actually a real implementation.
         self.assertEqual(host.filesystem.files[server._pid_file], None)