Remove unused imports in webkitpy with using autoflake.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_importer_unittest.py

 # Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
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 import optparse
-import shutil
-import tempfile
 import unittest
 
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.filesystem_mock import MockFileSystem
 from webkitpy.common.system.executive_mock import MockExecutive2, ScriptError
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.w3c.test_importer import TestImporter
 
 
 FAKE_SOURCE_DIR = '/blink/w3c'
@@ skipping 32 matching lines @@
         importer = TestImporter(host, FAKE_SOURCE_DIR, FAKE_REPO_DIR, optparse.Values(
             {"overwrite": False, 'destination': 'w3c', 'ignore_expectations': False}))
         oc = OutputCapture()
         oc.capture_output()
         try:
             importer.do_import()
         finally:
             oc.restore_output()
 
     # FIXME: Needs more tests.