Remove several unneeded modules from webkitpy.common.

Tools/Scripts/webkitpy/common/newstringio_unittest.py

-# Copyright (C) 2010 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.
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-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
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-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-
-"""Unit tests for newstringio module."""
-
-import unittest
-
-import newstringio
-
-
-class NewStringIOTest(unittest.TestCase):
-    def test_with(self):
-        with newstringio.StringIO("foo") as f:
-            contents = f.read()
-        self.assertEqual(contents, "foo")