Remove all unused variables.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.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
@@ skipping 1149 matching lines @@
 
     def add_expectations_from_bot(self):
         # FIXME: With mode 'very-flaky' and 'maybe-flaky', this will show the expectations entry in the flakiness
         # dashboard rows for each test to be whatever the bot thinks they should be. Is this a good thing?
         bot_expectations = self._port.bot_expectations()
         model = TestExpectationsModel(self._shorten_filename)
         for test_name in bot_expectations:
             expectation_line = self._parser.expectation_line_for_test(test_name, bot_expectations[test_name])
 
             # Unexpected results are merged into existing expectations.
-            merge = self._port.get_option('ignore_flaky_tests') == 'unexpected'
             model.add_expectation_line(expectation_line)
         self._model.merge_model(model)
 
     def add_expectation_line(self, expectation_line):
         self._model.add_expectation_line(expectation_line)
         self._expectations += [expectation_line]
 
     def remove_expectation_line(self, test):
         if not self._model.has_test(test):
             return
         self._expectations.remove(self._model.get_expectation_line(test))
         self._model.remove_expectation_line(test)
 
     @staticmethod
     def list_to_string(expectation_lines, test_configuration_converter=None, reconstitute_only_these=None):
         def serialize(expectation_line):
             # If reconstitute_only_these is an empty list, we want to return original_string.
             # So we need to compare reconstitute_only_these to None, not just check if it's falsey.
             if reconstitute_only_these is None or expectation_line in reconstitute_only_these:
                 return expectation_line.to_string(test_configuration_converter)
             return expectation_line.original_string
 
         def nones_out(expectation_line):
             return expectation_line is not None
 
         return "\n".join(filter(nones_out, map(serialize, expectation_lines)))