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

Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner_unittest.py

 # Copyright (C) 2012 Google Inc. All rights reserved.
 # Copyright (C) 2010 Gabor Rapcsanyi (rgabor@inf.u-szeged.hu), University of Szeged
 #
 # Redistribution and use in source and binary forms, with or without
 # 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,
 # 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 webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.systemhost_mock import MockSystemHost
 from webkitpy.layout_tests import run_webkit_tests
 from webkitpy.layout_tests.controllers.layout_test_runner import LayoutTestRunner, Sharder, TestRunInterruptedException
 from webkitpy.layout_tests.models import test_expectations
 from webkitpy.layout_tests.models import test_failures
 from webkitpy.layout_tests.models.test_run_results import TestRunResults
 from webkitpy.layout_tests.models.test_input import TestInput
 from webkitpy.layout_tests.models.test_results import TestResult
@@ skipping 249 matching lines @@
                 test_list=['virtual/foo/bar1.html', 'virtual/foo/bar2.html'])
         self.assert_shards(unlocked,
             [('virtual/foo', ['virtual/foo/bar1.html', 'virtual/foo/bar2.html'])])
 
         # But, with run_singly=True, we have to restart every time anyway, so we want full parallelism.
         locked, unlocked = self.get_shards(num_workers=2, fully_parallel=True, max_locked_shards=2, run_singly=True,
                 test_list=['virtual/foo/bar1.html', 'virtual/foo/bar2.html'])
         self.assert_shards(unlocked,
             [('.', ['virtual/foo/bar1.html']),
              ('.', ['virtual/foo/bar2.html'])])