Revert of Simplify the initialization of Git objects in Host.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_server.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 64 matching lines @@
             result_dict['state'] = STATE_NEEDS_REBASELINE
             result_dict['baselines'] = get_test_baselines(result.test_name(), self._test_config)
             new_tests_subtree[result.test_name()] = result_dict
 
         LayoutTestResults(results_json).for_each_test(gather_baselines_for_test)
         results_json['tests'] = new_tests_subtree
 
     def _prepare_config(self, options, args, tool):
         results_directory = args[0]
         host = Host()
+        host.initialize_scm()
 
         print 'Parsing full_results.json...'
         results_json_path = host.filesystem.join(results_directory, 'full_results.json')
         results_json = json_results_generator.load_json(host.filesystem, results_json_path)
 
         port = tool.port_factory.get()
         layout_tests_directory = port.layout_tests_dir()
         platforms = host.filesystem.listdir(host.filesystem.join(layout_tests_directory, 'platform'))
         self._test_config = TestConfig(port, layout_tests_directory, results_directory, platforms, host)
 
         print 'Gathering current baselines...'
         self._gather_baselines(results_json)
 
         return {
             'test_config': self._test_config,
             "results_json": results_json,
             "platforms_json": {
                 'platforms': platforms,
                 'defaultPlatform': port.name(),
             },
         }