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

Tools/Scripts/webkitpy/w3c/test_converter_unittest.py

-#!/usr/bin/env python
-
 # Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
 #
 # 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 THE COPYRIGHT HOLDER "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 HOLDER 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 os
 import re
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.host import Host
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.common.webkit_finder import WebKitFinder
 from webkitpy.thirdparty.BeautifulSoup import BeautifulSoup
 from webkitpy.w3c.test_converter import _W3CTestConverter
 
 DUMMY_FILENAME = 'dummy.html'
 DUMMY_PATH = 'dummy/testharness/path'
 
@@ skipping 337 matching lines @@
         # through the list to replace the double-digit tokens first
         index = len(test_properties) - 1
         while index >= 0:
             # Use the unprefixed version
             test_prop = test_properties[index].replace('-webkit-', '')
             # Replace the token
             html = html.replace('@test' + str(index) + '@', test_prop)
             index -= 1
 
         return (test_properties, html)