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

Tools/Scripts/webkitpy/common/find_files_unittest.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 # notice, this list of conditions and the following disclaimer.
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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
 # OWNER OR 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,
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 import sys
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.system.filesystem import FileSystem
 import find_files
 
 
 class MockWinFileSystem(object):
     def join(self, *paths):
         return '\\'.join(paths)
 
     def normpath(self, path):
@@ skipping 11 matching lines @@
         # what we think Windows is supposed to do. This test will run on all
         # platforms.
         self.assert_filesystem_normalizes(MockWinFileSystem())
 
     def test_win(self):
         # This tests the actual windows platform, to ensure we get the same
         # results that we get in test_mocked_win().
         if sys.platform != 'win32':
             return
         self.assert_filesystem_normalizes(FileSystem())