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

Tools/Scripts/webkitpy/tool/multicommandtool_unittest.py

 # Copyright (c) 2009 Google Inc. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 #     * Redistributions of source code must retain the above copyright
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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
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 import sys
-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from optparse import make_option
 
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.tool.multicommandtool import MultiCommandTool, Command, TryAgain
 
 
 class TrivialCommand(Command):
     name = "trivial"
     show_in_main_help = True
@@ skipping 123 matching lines @@
         self._assert_tool_main_outputs(tool, ["tool", "help", "--all-commands"], expected_all_commands_help)
         # Test that arguments can be passed before commands as well
         self._assert_tool_main_outputs(tool, ["tool", "--all-commands", "help"], expected_all_commands_help)
 
 
     def test_command_help(self):
         command_with_options = TrivialCommand(options=[make_option("--my_option")], long_help="LONG HELP")
         tool = TrivialTool(commands=[command_with_options])
         expected_subcommand_help = "trivial [options]   help text\n\nLONG HELP\n\nOptions:\n  --my_option=MY_OPTION\n\n"
         self._assert_tool_main_outputs(tool, ["tool", "help", "trivial"], expected_subcommand_help)