Fix pylint unused-* warnings in webkitpy/tool.

third_party/WebKit/Tools/Scripts/webkitpy/tool/servers/rebaselineserver.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 47 matching lines @@
 def _rebaseline_test(test_file, baseline_target, baseline_move_to, test_config, log):
     test_name, _ = os.path.splitext(test_file)
     test_directory = os.path.dirname(test_name)
 
     log('Rebaselining %s...' % test_name)
 
     actual_result_files = _get_actual_result_files(test_file, test_config)
     filesystem = test_config.filesystem
     scm = test_config.scm
     layout_tests_directory = test_config.layout_tests_directory
-    results_directory = test_config.results_directory
     target_expectations_directory = filesystem.join(
         layout_tests_directory, 'platform', baseline_target, test_directory)
     test_results_directory = test_config.filesystem.join(
         test_config.results_directory, test_directory)
 
     # If requested, move current baselines out
     current_baselines = get_test_baselines(test_file, test_config)
     if baseline_target in current_baselines and baseline_move_to != 'none':
         log('  Moving current %s baselines to %s' %
             (baseline_target, baseline_move_to))
@@ skipping 88 matching lines @@
         def __init__(self, host):
             super(AllPlatformsPort, self).__init__(host, 'mac')
             self._platforms_by_directory = dict([(self._webkit_baseline_path(p), p) for p in test_config.platforms])
 
         def baseline_search_path(self):
             return self._platforms_by_directory.keys()
 
         def platform_from_directory(self, directory):
             return self._platforms_by_directory[directory]
 
-    test_path = test_config.filesystem.join(test_config.layout_tests_directory, test_file)
-    host = test_config.host
-    all_platforms_port = AllPlatformsPort(host)
+    all_platforms_port = AllPlatformsPort(test_config.host)
 
     all_test_baselines = {}
     for baseline_extension in ('.txt', '.checksum', '.png'):
         test_baselines = test_config.test_port.expected_baselines(test_file, baseline_extension)
         baselines = all_platforms_port.expected_baselines(test_file, baseline_extension, all_baselines=True)
         for platform_directory, expected_filename in baselines:
             if not platform_directory:
                 continue
             if platform_directory == test_config.layout_tests_directory:
                 platform = 'base'
@@ skipping 86 matching lines @@
         elif mode == 'diff-text':
             file_name = test_name + '-diff.txt'
         elif mode == 'diff-text-pretty':
             file_name = test_name + '-pretty-diff.html'
 
         file_path = os.path.join(self.server.test_config.results_directory, file_name)
 
         # Let results be cached for 60 seconds, so that they can be pre-fetched
         # by the UI
         self._serve_file(file_path, cacheable_seconds=60)