Remove unused imports in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/flakytests.py

 # Copyright (c) 2011 Google Inc. All rights reserved.
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 import logging
-import os
-import optparse
 from webkitpy.tool.multicommandtool import AbstractDeclarativeCommand
 from webkitpy.layout_tests.layout_package.bot_test_expectations import BotTestExpectationsFactory
-from webkitpy.layout_tests.models.test_expectations import TestExpectationParser, TestExpectationsModel, TestExpectations
+from webkitpy.layout_tests.models.test_expectations import TestExpectations
+from webkitpy.layout_tests.models.test_expectations import TestExpectationsModel
 from webkitpy.layout_tests.port import builders
-from webkitpy.common.net import sheriff_calendar
 
 
 _log = logging.getLogger(__name__)
 
 
 class FlakyTests(AbstractDeclarativeCommand):
     name = "print-flaky-tests"
     help_text = "Print out flaky lines from the flakiness dashboard"
     show_in_main_help = True
 
@@ skipping 69 matching lines @@
         fs = tool.filesystem
         lines = filter(lambda line: fs.exists(fs.join(port.layout_tests_dir(), line.path)), lines)
 
         test_names = [line.name for line in lines]
         flakiness_dashbord_url = self.FLAKINESS_DASHBOARD_URL % ','.join(test_names)
         expectations_string = TestExpectations.list_to_string(lines)
 
         # pylint: disable=E1601
         print self.OUTPUT % (self.HEADER, expectations_string, flakiness_dashbord_url)