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

Tools/Scripts/webkitpy/test/runner_unittest.py

 # Copyright (C) 2012 Google, Inc.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 # 2.  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.
 #
 # THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
 # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+import StringIO
 import logging
 import re
-import StringIO
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.system.filesystem import FileSystem
 from webkitpy.common.webkit_finder import WebKitFinder
 
 from webkitpy.tool.mocktool import MockOptions
 from webkitpy.test.printer import Printer
 from webkitpy.test.runner import Runner
 
 
 class FakeModuleSuite(object):
@@ skipping 54 matching lines @@
         options = MockOptions(verbose=verbose, timing=timing, child_processes=child_processes, quiet=quiet, pass_through=False)
         stream = StringIO.StringIO()
         loader = FakeLoader(('test1 (Foo)', '.', ''),
                             ('test2 (Foo)', 'F', 'test2\nfailed'),
                             ('test3 (Foo)', 'E', 'test3\nerred'))
         runner = Runner(Printer(stream, options), loader, WebKitFinder(FileSystem()))
         runner.run(['Foo.test1', 'Foo.test2', 'Foo.test3'], 1)
         self.assertEqual(runner.tests_run, 3)
         self.assertEqual(len(runner.failures), 1)
         self.assertEqual(len(runner.errors), 1)