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

Tools/Scripts/webkitpy/w3c/test_importer_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
@@ skipping 10 matching lines @@
 # 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 optparse
 import shutil
 import tempfile
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.filesystem_mock import MockFileSystem
 from webkitpy.common.system.executive_mock import MockExecutive2, ScriptError
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.w3c.test_importer import TestImporter
 
 
 FAKE_SOURCE_DIR = '/blink/w3c'
 FAKE_REPO_DIR = '/blink'
@@ skipping 27 matching lines @@
 
         importer = TestImporter(host, FAKE_SOURCE_DIR, FAKE_REPO_DIR, optparse.Values({"overwrite": False, 'destination': 'w3c', 'ignore_expectations': False}))
         oc = OutputCapture()
         oc.capture_output()
         try:
             importer.do_import()
         finally:
             oc.restore_output()
 
     # FIXME: Needs more tests.