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

Tools/Scripts/webkitpy/tool/servers/reflectionhandler_unittest.py

 # Copyright (C) 2012 Google Inc. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * 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
 # copyright notice, this list of conditions and the following disclaimer
 # in the documentation and/or other materials provided with the
 # distribution.
 #    * Neither the name of Google Inc. nor the names of its
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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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 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.tool.servers.reflectionhandler import ReflectionHandler
 
 
 class TestReflectionHandler(ReflectionHandler):
     STATIC_FILE_DIRECTORY = "/"
 
     def __init__(self):
         self.static_files_served = set()
         self.errors_sent = set()
@@ skipping 50 matching lines @@
         self.assert_handler_response(["/test.js", "/test.css", "/test.html"], set(["test.js", "test.html", "test.css"]), set(), set())
         self.assert_handler_response(["/test.js", "/test.exe", "/testhtml"], set(["test.js"]), set([404]), set())
         self.assert_handler_response(["/test.html", "/function.one"], set(["test.html"]), set(), set(['function_one']))
         self.assert_handler_response(["/some.html"], set(["some.html"]), set(), set())
 
     def test_svn_log_non_ascii(self):
         xmlChangelog = u'<?xml version="1.0"?>\n<log>\n<logentry revision="1">\n<msg>Patch from John Do\xe9.</msg>\n</logentry>\n</log>'
         handler = TestReflectionHandlerServeXML()
         handler.serve_xml(xmlChangelog)
         self.assertEqual(handler.wfile.data, xmlChangelog.encode('utf-8'))