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

Tools/Scripts/webkitpy/common/system/profiler_unittest.py

 # Copyright (C) 2012 Google Inc. All rights reserved.
 #
 # 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
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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.system.platforminfo_mock import MockPlatformInfo
 from webkitpy.common.system.systemhost_mock import MockSystemHost
 
 from .profiler import ProfilerFactory, GooglePProf
 
 
 class ProfilerFactoryTest(unittest.TestCase):
     def _assert_default_profiler_name(self, os_name, expected_profiler_name):
         profiler_name = ProfilerFactory.default_profiler_name(MockPlatformInfo(os_name))
@@ skipping 54 matching lines @@
       42   1.1%   7.6%       47   1.2% WTF::Vector::shrinkCapacity
       35   0.9%   8.5%       35   0.9% WTF::RefPtr::get (inline)
       33   0.9%   9.4%       43   1.1% append (inline)
       29   0.8%  10.1%       67   1.8% WTF::StringImpl::deref (inline)
       29   0.8%  10.9%      100   2.7% add (inline)
       28   0.7%  11.6%       28   0.7% WebCore::QualifiedName::localName (inline)
 """
         host = MockSystemHost()
         profiler = GooglePProf(host, '/bin/executable', '/tmp/output')
         self.assertEqual(profiler._first_ten_lines_of_profile(pprof_output), expected_first_ten_lines)