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

Tools/Scripts/webkitpy/tool/commands/queries_unittest.py

 # Copyright (C) 2009 Google Inc. All rights reserved.
 # Copyright (C) 2012 Intel Corporation. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
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 #    * 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
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 # this software without specific prior written permission.
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 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.thirdparty.mock import Mock
 from webkitpy.layout_tests.port.test import TestPort
 from webkitpy.tool.commands.commandtest import CommandsTest
 from webkitpy.tool.commands.queries import *
 from webkitpy.tool.mocktool import MockTool, MockOptions
 
 
@@ skipping 112 matching lines @@
 
     def test_csv(self):
         command = PrintBaselines()
         command.bind_to_tool(self.tool)
         self.capture_output()
         command.execute(MockOptions(all=False, platform='*xp', csv=True, include_virtual_tests=False), ['passes/text.html'], self.tool)
         stdout, _, _ = self.restore_output()
         self.assertMultiLineEqual(stdout,
                           ('test-win-xp,passes/text.html,None,png,passes/text-expected.png,None\n'
                            'test-win-xp,passes/text.html,None,txt,passes/text-expected.txt,None\n'))