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

Tools/Scripts/webkitpy/layout_tests/port/android_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
 # contributors may be used to endorse or promote products derived from
 # 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 StringIO
 import optparse
-import StringIO
+import sys
 import time
-import webkitpy.thirdparty.unittest2 as unittest
-import sys
+import unittest
 
 from webkitpy.common.system import executive_mock
 from webkitpy.common.system.executive_mock import MockExecutive2
 from webkitpy.common.system.systemhost_mock import MockSystemHost
 
 from webkitpy.layout_tests.port import android
 from webkitpy.layout_tests.port import port_testcase
 from webkitpy.layout_tests.port import driver
 from webkitpy.layout_tests.port import driver_unittest
 from webkitpy.tool.mocktool import MockOptions
@@ skipping 267 matching lines @@
     # Tests that valid tombstone listings will return the contents of the most recent file.
     def test_read_valid_tombstone_file(self):
         self._mock_adb.set_tombstone_output('-rw------- 1000 1000 3604 2013-11-19 16:15 tombstone_00\n' +
                                             '-rw------- 1000 1000 3604 2013-11-19 16:16 tombstone_10\n' +
                                             '-rw------- 1000 1000 3604 2013-11-19 16:15 tombstone_02')
         stacktrace = self._driver._get_last_stacktrace()
 
         self.assertEqual(0, len(self._warnings))
         self.assertEqual(0, len(self._errors))
         self.assertEqual(ChromiumAndroidDriverTombstoneTest.EXPECTED_STACKTRACE, stacktrace)